defconfig: remove all mach variant lines to fix building with ROM

Change-Id: I76fec088f2b3b5f5e2fda1a4358f856e761b61d5
Revert "GPU: Go to 533 Mhz fix up the incorrect pll references for Mhz calculation: pushistiky"

This reverts commit 379cac67fa8c71b10bc524ef4b3a5e271481e7c5.
Revert "Try some GPU OC and see what happens"

This reverts commit fe316cc0fde58c63803b7854b6ce99fe921f9eb3.
GPU: OC: A nice little way to modify pll15_config.l on the fly to provide OC steps of 504, 544 and 600.  Still trying to find a way to reflect tha actual max_gpuclk, all commented code still wont allow it, will look at agin at a later date
GPU: re-add max_vectors MBPS value of 4816
ARM: mutex: use generic atomic_dec-based implementation for ARMv6+

Commit a76d7bd96d65 ("ARM: 7467/1: mutex: use generic xchg-based
implementation for ARMv6+") removed the barrier-less, ARM-specific
mutex implementation in favour of the generic xchg-based code.

Since then, a bug was uncovered in the xchg code when running on SMP
platforms, due to interactions between the locking paths and the
MUTEX_SPIN_ON_OWNER code. This was fixed in 0bce9c46bf3b ("mutex: place
lock in contended state after fastpath_lock failure"), however, the
atomic_dec-based mutex algorithm is now marginally more efficient for
ARM (~0.5% improvement in hackbench scores on dual A15).

This patch moves ARMv6+ platforms to the atomic_dec-based mutex code.

Change-Id: I5cb600b15f891dc692356322b38cae1d692a084c
Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
CPU hotplug, writeback: Don't call writeback_set_ratelimit() too often during hotplug

The CPU hotplug callback related to writeback calls writeback_set_ratelimit()
during every state change in the hotplug sequence. This is unnecessary
since num_online_cpus() changes only once during the entire hotplug operation.

So invoke the function only once per hotplug, thereby avoiding the
unnecessary repetition of those costly calculations.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
build-scripts: fixup Verizon build script

Change-Id: Ide578e7d4e3d66e1081c39b66557e6c113de6965