Support BGRA framebuffer

The re-designed recovery graphics code only supports RGB{_,X,A}
framebuffer, and this patch adds support for BGRA framebuffer.

Change-Id: I3780c8288088f497fa248f3492c54f43834a8598
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Reviewed-by: Jovanovic, Radivoje <radivoje.jovanovic@intel.com>
Reviewed-by: Parkinson, TimothyX L <timothyx.l.parkinson@intel.com>
Tested-by: Parkinson, TimothyX L <timothyx.l.parkinson@intel.com>
Reviewed-by: Boie, Andrew P <andrew.p.boie@intel.com>
Reviewed-by: Gumbel, Matthew K <matthew.k.gumbel@intel.com>