ARM: cache-l2x0: Save L2CC registers using pl310 save/resume

This reverts commit a022290fe5165ffe4973355cb76556ce8c629d70.

Save the contents of the L2CC registers in l2x0_init itself as
they are not modified later.

CRs-Fixed: 356696
Change-Id: I05ec3bcce8d1e2f941a9ecbaae8c6598f52831c5
Signed-off-by: Taniya Das <tdas@codeaurora.org>
(cherry picked from commit 38a8c6e63b1478cc520c795e07cd1b6370901d06)

Conflicts:

	arch/arm/include/asm/hardware/cache-l2x0.h
	arch/arm/mach-msm/pm-8x60.c
	arch/arm/mach-msm/pm2.c
	arch/arm/mm/cache-l2x0.c