msm: HTC: m7: Add M7 board makefiles

Change-Id: I48e549e3e94a0274282b3d220be79b58abe5dcf1

Conflicts:
	arch/arm/mach-msm/htc/Kconfig.board
	arch/arm/mach-msm/htc/Makefile.board
msm: HTC: m7: update board audio file

Change-Id: Icfdc146322ac8a77a61e6e64c32b45fcbc3d6bfc

Conflicts:
	arch/arm/mach-msm/htc/m7/board-m7-audio.c