incallui: make navigation bar translucent + other fixes

* Make navigation bar translucent when available, minimizing thec bad
  effect of the black navigation bar.
* Complete change Ie76cbc53c176d94bfb2402bf50eae6161fbb2198, displaying
  the caller photo in complete full window size.
* Sync Msim layouts with normal layouts

Patchset 3: Use full translucent bars (status + navigation)
Patchset 4: Revert layouts
Patchset 5: Simplification, use transparent status bar during call
Patchset 6: Fix dialpad layout
Patchset 7: update translucency flags when hiding conference manager
Patchset 8: also make status bar translucent when dialpad is shown

Change-Id: I3a9e4e248f19b951dd6a127b6f63a0cd62047497