PEEK: configurable pickup timeout (1/2)

- Allow the user to set different pickup timeout when a notification comes up through PEEK.

Change-Id: Ifcd2f13101dcf6973ebcf016bce5f5314e1ce04c
Signed-off-by: anerikg <anerikgames@gmail.com>

Conflicts:
	core/java/android/provider/Settings.java