Save space in small width screens

In order to leave more space for carrier names in QS, do the following:
* Remove enterprise icon from QQS/QS icons
* If screen is less than 390dp wide, don't show battery estimate and
instead show percentage.

Test: manual, multiple densities and landscape
Fixes: 189413614
Change-Id: I4758d3822dc07e42b254b8b48c9905231748165a