msm: HTC: Add HTC specific board extension header

Change-Id: I7966f15769ed924730f82ba9125d7f52660508a5
msm: HTC: Add nand flash device to devices-8960

Change-Id: I3328e3ca0af9c3611b025293a229b313d878c683

Conflicts:
	arch/arm/mach-msm/devices-8960.c