BeagleBoard: Configure DVI/S-video

Based on patches from Syed Mohammed Khasim (khasim@ti.com).

Configures the output of the BeagleBoard DVI to be orange.
Configures the output of the BeagleBoard S-Video to be a colorbar.

Changed display_init to beagle_display_init as suggested by Igor Grinberg:
http://www.mail-archive.com/u-boot@lists.denx.de/msg51446.html



Signed-off-by: Jason Kridner <jkridner@beagleboard.org>
Signed-off-by: Joel A Fernandes <agnel.joel@gmail.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>