Attempt to fix missing transport control in keyguard

This attempts to fix a bug where the transport control would sometimes be
inoperative.  The problem is that we had two transport control layouts
on some devices because they were being declared in the layout file.

The fix is to only inflate the layout once when KeyguardHostView
is created.

Also removes redundant KeyguardStatusView.

Fixes bug 7254833

Change-Id: Iab84e8326ff745ee57be5177ab2561114c8dc6f0