[2/2] Add support for Peek app

https://github.com/AOSPA/android_packages_apps_Settings/commit/fe92098bac847ebb53b2e6be26be59db66bbd1f1#diff-c8e3aa06f1ce774f0a7772d8d17a5d7fR94

Disable built in peek when Peek app is installed. Enable it again on app's unistall.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Conflicts:
	src/com/android/settings/DisplaySettings.java