tegra3-common: Add button brightness control to Tegra3Parts

Change-Id: Ie89437dc476fcd27d2ca38495e8330357a3a7d4e
tegra3-common: Add vibration intensity control to Tegra3Parts

Change-Id: I4d99101a8ae4bfdfe2c6421edda9cc115ec4b0b9
V4a addition

Conflicts:
	liblights/omni_lights.c