CVE-2021-47647: clk: qcom: ipq8074: fix PCI-E clock oops
In the Linux kernel, the following vulnerability has been resolved:

clk: qcom: ipq8074: fix PCI-E clock oops

Fix PCI-E clock related kernel oops that are caused by a missing clock
parent.

pcie0_rchng_clk_src has num_parents set to 2 but only one parent is
actually set via parent_hws, it should also have "XO" defined.
This will cause the kernel to panic on a NULL pointer in
clk_core_get_parent_by_index().

So, to fix this utilize clk_parent_data to provide gcc_xo_gpll0 parent
data.
Since there is already an existing static const char * const gcc_xo_gpll0[]
used to provide the same parents via parent_names convert those users to
clk_parent_data as well.

Without this earlycon is needed to even catch the OOPS as it will reset
the board before serial is initialized with the following:

[    0.232279] Unable to handle kernel paging request at virtual address 0000a00000000000
[    0.232322] Mem abort info:
[    0.239094]   ESR = 0x96000004
[    0.241778]   EC = 0x25: DABT (current EL), IL = 32 bits
[    0.244908]   SET = 0, FnV = 0
[    0.250377]   EA = 0, S1PTW = 0
[    0.253236]   FSC = 0x04: level 0 translation fault
[    0.256277] Data abort info:
[    0.261141]   ISV = 0, ISS = 0x00000004
[    0.264262]   CM = 0, WnR = 0
[    0.267820] [0000a00000000000] address between user and kernel address ranges
[    0.270954] Internal error: Oops: 96000004 [#1] SMP
[    0.278067] Modules linked in:
[    0.282751] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.15.10 #0
[    0.285882] Hardware name: Xiaomi AX3600 (DT)
[    0.292043] pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    0.296299] pc : clk_core_get_parent_by_index+0x68/0xec
[    0.303067] lr : __clk_register+0x1d8/0x820
[    0.308273] sp : ffffffc01111b7d0
[    0.312438] x29: ffffffc01111b7d0 x28: 0000000000000000 x27: 0000000000000040
[    0.315919] x26: 0000000000000002 x25: 0000000000000000 x24: ffffff8000308800
[    0.323037] x23: ffffff8000308850 x22: ffffff8000308880 x21: ffffff8000308828
[    0.330155] x20: 0000000000000028 x19: ffffff8000309700 x18: 0000000000000020
[    0.337272] x17: 000000005cc86990 x16: 0000000000000004 x15: ffffff80001d9d0a
[    0.344391] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000006
[    0.351508] x11: 0000000000000003 x10: 0101010101010101 x9 : 0000000000000000
[    0.358626] x8 : 7f7f7f7f7f7f7f7f x7 : 6468626f5e626266 x6 : 17000a3a403c1b06
[    0.365744] x5 : 061b3c403a0a0017 x4 : 0000000000000000 x3 : 0000000000000001
[    0.372863] x2 : 0000a00000000000 x1 : 0000000000000001 x0 : ffffff8000309700
[    0.379982] Call trace:
[    0.387091]  clk_core_get_parent_by_index+0x68/0xec
[    0.389351]  __clk_register+0x1d8/0x820
[    0.394210]  devm_clk_hw_register+0x5c/0xe0
[    0.398030]  devm_clk_register_regmap+0x44/0x8c
[    0.402198]  qcom_cc_really_probe+0x17c/0x1d0
[    0.406711]  qcom_cc_probe+0x34/0x44
[    0.411224]  gcc_ipq8074_probe+0x18/0x30
[    0.414869]  platform_probe+0x68/0xe0
[    0.418776]  really_probe.part.0+0x9c/0x30c
[    0.422336]  __driver_probe_device+0x98/0x144
[    0.426329]  driver_probe_device+0x44/0x11c
[    0.430842]  __device_attach_driver+0xb4/0x120
[    0.434836]  bus_for_each_drv+0x68/0xb0
[    0.439349]  __device_attach+0xb0/0x170
[    0.443081]  device_initial_probe+0x14/0x20
[    0.446901]  bus_probe_device+0x9c/0xa4
[    0.451067]  device_add+0x35c/0x834
[    0.454886]  of_device_add+0x54/0x64
[    0.458360]  of_platform_device_create_pdata+0xc0/0x100
[    0.462181]  of_platform_bus_create+0x114/0x370
[    0.467128]  of_platform_bus_create+0x15c/0x370
[    0.471641]  of_platform_populate+0x50/0xcc
[    0.476155]  of_platform_default_populate_init+0xa8/0xc8
[    0.480324]  do_one_initcall+0x50/0x1b0
[    0.485877]  kernel_init_freeable+0x234/0x29c
[    0.489436]  kernel_init+0x24/0x120
[    0.493948]  ret_from_fork+0x10/0x20
[    0.497253] Code: d50323bf d65f03c0 f94002a2 b4000302 (f9400042)
[    0.501079] ---[ end trace 4ca7e1129da2abce ]---
CVSS v3.1: 5.5