omaplfb: add support for blitter for second fb

enable blitting for second fb for multi display
in presentation mode

Change-Id: I7bc23c5446df101f8beca7fdc6421ae9d45224a4
Signed-off-by: Sundar Raman <a0393242@ti.com>
android-display: allocate two buffers for FB by default

only one buffer was being allocated for FB vram by default.
blitter requires two buffers for flip flop

Change-Id: I05bbaae2f93903fdea52caa5b5a0294b39680bfc
Signed-off-by: Sundar Raman <a0393242@ti.com>

Cherry-picked from:
http://review.omapzoom.org/#/c/32397/
Using the physical LCD display as default display. This is used to determine the display resolution in android-display.c class.
Add panel size to the panel definition. This is used to determine the display resolution in android-display.c.