aess: hack: disable runtime-pm

Runtime PM triggers a hwmod_idle of aess that fails all the time. This leaves SR
deactivated for IVA domain.

While root cause is not identified and while waiting for a proper fix, use
this hack to prevent runtime PM on aess. This 'fixes' SR for IVA domain.

Without this hack, we get '_wait_target_disable failed' errors. See below with
additional custom trace and stack dump (the point was to trace when SR is disabled):
[   44.294586] omap_hwmod: aess: _wait_target_disable failed
[   44.294586] sebj - clkdm_hwmod_disable - aess
[   44.294616] sebj - omap_sr_disable - iva[<c001b9e8>] (unwind_backtrace+0x0/0xec) from [<c05fab88>] (dump_stack+0x20/0x24)
[   44.294647] [<c05fab88>] (dump_stack+0x20/0x24) from [<c002e94c>] (omap_sr_disable+0x48/0x88)
[   44.294647] [<c002e94c>] (omap_sr_disable+0x48/0x88) from [<c0030e38>] (voltdm_pwrdm_disable+0x48/0x98)
[   44.294677] [<c0030e38>] (voltdm_pwrdm_disable+0x48/0x98) from [<c00333e0>] (pwrdm_clkdm_disable+0x44/0x48)
[   44.294677] [<c00333e0>] (pwrdm_clkdm_disable+0x44/0x48) from [<c0034d24>] (clkdm_usecount_dec+0x44/0x4c)
[   44.294708] [<c0034d24>] (clkdm_usecount_dec+0x44/0x4c) from [<c0034d88>] (_clkdm_clk_hwmod_disable+0x5c/0xc8)
[   44.294708] [<c0034d88>] (_clkdm_clk_hwmod_disable+0x5c/0xc8) from [<c0034ef0>] (clkdm_hwmod_disable+0x48/0x5c)
[   44.294738] [<c0034ef0>] (clkdm_hwmod_disable+0x48/0x5c) from [<c00292e8>] (_idle+0x168/0x1ac)
[   44.294738] [<c00292e8>] (_idle+0x168/0x1ac) from [<c0029898>] (omap_hwmod_idle+0x34/0x50)
[   44.294769] [<c0029898>] (omap_hwmod_idle+0x34/0x50) from [<c003d04c>] (omap_device_idle_hwmods+0x30/0x44)
[   44.294769] [<c003d04c>] (omap_device_idle_hwmods+0x30/0x44) from [<c003d200>] (_omap_device_deactivate+0x68/0x130)
[   44.294799] [<c003d200>] (_omap_device_deactivate+0x68/0x130) from [<c003da54>] (omap_device_idle+0x50/0x64)
[   44.294799] [<c003da54>] (omap_device_idle+0x50/0x64) from [<c003da94>] (_od_runtime_suspend+0x2c/0x34)
[   44.294830] [<c003da94>] (_od_runtime_suspend+0x2c/0x34) from [<c03ad498>] (__rpm_callback+0x48/0x78)
[   44.294830] [<c03ad498>] (__rpm_callback+0x48/0x78) from [<c03adb68>] (rpm_suspend+0x3d0/0x668)
[   44.294860] [<c03adb68>] (rpm_suspend+0x3d0/0x668) from [<c03aecbc>] (__pm_runtime_suspend+0x6c/0x84)
[   44.294860] [<c03aecbc>] (__pm_runtime_suspend+0x6c/0x84) from [<c03a9f30>] (pm_generic_runtime_idle+0x54/0x5c)
[   44.294891] [<c03a9f30>] (pm_generic_runtime_idle+0x54/0x5c) from [<c003d018>] (_od_runtime_idle+0x18/0x1c)
[   44.294891] [<c003d018>] (_od_runtime_idle+0x18/0x1c) from [<c03ad498>] (__rpm_callback+0x48/0x78)
[   44.294921] [<c03ad498>] (__rpm_callback+0x48/0x78) from [<c03ae074>] (rpm_idle+0x1f0/0x2c8)
[   44.294921] [<c03ae074>] (rpm_idle+0x1f0/0x2c8) from [<c03ae238>] (__pm_runtime_idle+0x6c/0x84)
[   44.294952] [<c03ae238>] (__pm_runtime_idle+0x6c/0x84) from [<c04d5f98>] (ul_mux_put_route+0x110/0x120)
[   44.294952] [<c04d5f98>] (ul_mux_put_route+0x110/0x120) from [<c04b0a88>] (snd_ctl_ioctl+0x4a4/0x848)
[   44.294982] [<c04b0a88>] (snd_ctl_ioctl+0x4a4/0x848) from [<c014ef40>] (do_vfs_ioctl+0x4f8/0x56c)
[   44.294982] [<c014ef40>] (do_vfs_ioctl+0x4f8/0x56c) from [<c014f014>] (sys_ioctl+0x60/0x84)
[   44.295013] [<c014f014>] (sys_ioctl+0x60/0x84) from [<c00130e0>] (ret_fast_syscall+0x0/0x30)

Signed-off-by: Sebastien Jan <s-jan@ti.com>