Settings: Day and week on data usage cycle (2/2)

Adds the ability to set day and week on when the data usage
graph resets, instead of just month.

Change-Id: I5974e1b7143d09ffd6fcd6db113c3f7511346bfa

Conflicts:
	res/values/cm_arrays.xml

	modified:   res/layout/data_usage_cycle_editor.xml
	modified:   res/values/cm_arrays.xml
	modified:   res/values/strings.xml
	modified:   src/com/android/settings/DataUsageSummary.java
	modified:   src/com/android/settings/net/NetworkPolicyEditor.java