msm: Add low power mode for dynamic memory managment.

Add Low Power mode TAG.
Add new API's for mem lowpower modes.
Create new sys file for mem low power modes.
Set SECTION_SIZE_BITS to 28.
Change NPA_MEMORY_NODE_NAME to "/mem/apps/ddr_dpd".
Fix NPA node create function to do atomic_inc()
in atomic_dec_and_test() failure case.

Change-Id: Ia5cb18b99338c43165d5401e619c773cd8d6b3f6
Signed-off-by: Larry Bassel <lbassel@codeaurora.org>
(cherry picked from commit b054046e708f8c5b044e76c2df6f72fd607be558)

Conflicts:

	arch/arm/include/asm/setup.h
	arch/arm/kernel/setup.c
	arch/arm/mach-msm/include/mach/memory.h
	arch/arm/mach-msm/memory.c
	drivers/base/memory.c
	include/linux/memory_hotplug.h