vendor: Allow devices to set the GMS client id

This will look for flags in omni_<device>.mk, if none preset, use ro.com.google.clientidbase=android-google

Conflicts:
	config/common.mk

Change-Id: I42957104837b96ea24e485c8dd2e6332ff42d5b7
Merge "vendor: Allow devices to set the GMS client id" into android-4.4
Mackay ROM

Change-Id: Ie881215e05451ef85cd72411b6f57c0b13faf0bd
Changed package selection

Change-Id: I22e41eff8928cce4d75095370b10fcbbb46b6ce8
Add prebuilt SuperSU

Change-Id: I1ba7845150d64b2de4c4ac6b73ba283c99aba8db