arm: msm: add cpu frequency controls

This adds acpuclock-arm11.c from Google. This provides control
over the cpu frequency for arm11 cpu's.

This has shared authorship between Google, and Qualcomm. Most
of it was written by Mike Chan at Google.

Signed-off-by: Daniel Walker <dwalker@codeaurora.org>

arch/arm/mach-msm/Makefile

@@ -2,6 +2,7 @@ obj-y += io.o idle.o irq.o timer.o dma.o
 obj-y += devices.o
 obj-y += proc_comm.o
 obj-y += vreg.o
+obj-y += acpuclock-arm11.o
 obj-y += clock.o clock-7x01a.o
 
 obj-$(CONFIG_MACH_HALIBUT) += board-halibut.o