Revert "Switch over to getting 12-/24-hour time formats from CLDR via icu4c."

This reverts commit 4caba61ea0433099fc94e61221d02542c34e9e3a.

Conflicts:
	core/java/android/text/format/DateFormat.java
	core/res/res/values-nb/donottranslate-cldr.xml
	packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java