QS: Cellular usage warning marker + policy cycle.

Add warning marker to graph from policy, and use the
cycle day from policy to determine the usage period.

Change-Id: I31711eea6a0bf54ad0eb5841d2aa9b8e5927ed58
(cherry picked from commit b5e88019cd69d9320639b6736fabf7f407444967)
6 files changed