m8: remove deprecated overlays, disable perf overlays for now

Change-Id: I604c4b7c39b07acf62d6e44b785c9a65f6cb56b8
Merge remote-tracking branch 'cm/cm-12.0' into cm-12.0

Conflicts:
	overlay/frameworks/base/core/res/res/values/config.xml
	overlay/frameworks/base/packages/SettingsProvider/res/values/defaults.xml

Change-Id: Ib620abea3a74a805cf4ee1c1b7b5fefd6fa6299e