Settings: Add vibration intensity support

(cherry picked from commit 4fc0d14ce8fff95b2bdd10d02049f650cf1476cf)

Conflicts:
	src/com/android/settings/notification/NotificationSettings.java

(cherry picked from commit 075a1c7d3a0ef871ae6a97847e85ad503640b32d)

Conflicts:
	res/values/cr_strings.xml