m7: advanced settings: add proximity sensor calibration

ohai cid!

Change-Id: Iecbf53731c3a9c33fed4e512fba9d8eac9e384c4

Conflicts:
	DeviceSettings/res/values/strings.xml
m7: init: fix typo in proximity node

Change-Id: Icfd4ee75a53db1cbbf9efe0b23aee3ad2c8ddc36
m7: advanced settings: add more proximity calibration values

Change-Id: I0f567861954bab3b9b537839301c62ade039a651