add proxomity flag

Conflicts:

	overlay/frameworks/base/core/res/res/values/config.xml

Change-Id: I68c0fe2fd2070e581eeef2590f49508cdb524afa
Location overlays: moto_msm8960 and oppo/apq8064 use these. I'm going to assume samsung hasn't joined that club.

Change-Id: I05001a7e9518efd53219d492e64339603aaba4ae
overlay: this seems like a good idea.

Change-Id: I49c944a5467a6340ce22532ae8ad72f7bc7444b9