Revert "Disable notification count on status bar"

This reverts commit f4f5dce56d3ef93cdb6b4c475b2f598e2a5e26de.
systemui: Forward-port notification counters

 * Port from CM11

Change-Id: Id9d0954acffd00bdb470b9eccbdb3b45fbd995c1

Conflicts:
	packages/SettingsProvider/res/values/defaults.xml
	packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java