KeyGuard: minimize challenge when showing the lockscreen (1/2)

This will allow the user to choose wether the lockscreen
challenge (circle, pattern, pin) is minimized when the screen
is turned on.

Change-Id: Ib6f3cde5f2f951b42a9e8a0b5897ace864c4f6c3
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
p2p: Display P2P peer MAC address if device name is empty.

Display MAC address of a P2P peer in an invitation prompt
message on receiving invitation request from the P2P peer
with empty device name.

Change-Id: Icabeb91d666437746eb5a733ec582849eb7295a5
CRs-Fixed: 506109
SystemUI: fix battery text % dropping to 0

When the statusbar was recreated, the battery
text view was using the old reference and callback
(which didn't exist anymore). So just recreate the
text view with the statusbar.

Change-Id: I1f246a16d0a7d84054052372b68ec220eb4a7d27
Signed-off-by: Roman Birg <romanbirg@gmail.com>
SystemUI: add legacy menu button back

Change-Id: I32d687c2dd2682036ceee1032b777b9b10987ffd
Signed-off-by: Roman Birg <romanbirg@gmail.com>