msm: acpuclock: Implement acpuclock APIs through function pointers

Create a generic wrapper acpuclock driver in acpuclock.c to call
SoC-specific function pointer API implementations.  With the
exception of iomap conflicts, this should allow multiple acpuclock
driver implementations to be compiled into the same kernel binary.

Signed-off-by: Matt Wagantall <mattw@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/acpuclock-7201.c
	arch/arm/mach-msm/board-msm8960.c
17 files changed