arm: mach-msm: board-htc-8974: import m8whl (Sprint) and w8wl (VZW) variant

Change-Id: Ie92eee3c7bfdf8ccc260b07a6691198885d38ab0

Conflicts:
	arch/arm/mach-msm/Kconfig
	arch/arm/mach-msm/Makefile.boot
	arch/arm/mach-msm/board-htc-8974.c