OMAP5-board: add support 2 framebuffer device

Add support for second framebuffer initialization.

Change-Id: Id8c3ef19d28b2a6507d4ec8575cce5a06500eba0
Signed-off-by: Rakesh Movva <a0273913ubuntu@ud2a0273913>
Signed-off-by: Dandawate Saket <dsaket@ti.com>