g3: add bump script

* auto bumps boot and recovery images
* to enable for your variant, set TARGET_REQUIRES_BUMP in BoardConfig

Change-Id: Ib04dda56564c8b89f9c24a75ef5dffc43073b063
[TEMP] g3: disable overlay settings that don't exist

Change-Id: I781a6c39286424f4e5312aa73395142312a6546d
g3: enable BOARD_CUSTOM_BOOTIMG

Change-Id: Ifc6bb57911fc65d579b81f4e97672426c07948f7
g3: remove qrngd and qrngp

Change-Id: I1101c9ad59711b8ec8ebc222ec23c445c196f592
Merge "g3: remove qrngd and qrngp" into cm-12.0
Enable configuration of notification LED color

Change-Id: Ia343d17eb8329f64c3dd8b2174ac9e7d935c1746
g3: split mixer_paths for bcm/wcnss

Change-Id: Ic29f8420297f55091736d04cb4dece30ac6cbe4c
Merge remote-tracking branch 'upstream/cm-12.0' into lollipop