Revert "Add back navigation bar customization."

This reverts commit 3d78c928b3cdee7c2bf54c73ed4e8efd02cf8b87.

Conflicts:
	src/com/android/settings/Utils.java

Change-Id: If082473a4a850c814450e2da347c1cd357dcf3b0
Revert "Add back navigation ring customization."

This reverts commit ab99452d34b8ce4f73cfa2365422ea0507ce6552.

Conflicts:
	res/values/cm_dimens.xml
	res/values/cm_strings.xml
	res/xml/system_ui_settings.xml
	src/com/android/settings/cyanogenmod/SystemUiSettings.java

Change-Id: I8343facd58afd05454ea4c24518f599118dd05b6