base

Fix 5044158: layout and asset work on lockscreen PIN mode

Fix PIN entry layout issues on hdpi, large-mdpi and xhdpi devices where emergencyCallButton was partially off-screen.

Copy button assets from latinIME for PIN screen.

Make PIN keyboard horizontal and vertical gaps configurable.

Change-Id: I415fcd83f02971b987c3df418d4114b8e1ab3945