fb: add auto-config w/EDID

Add support to configure the frame buffer driver using EDID
read from the display.
splash: framebuffer test program

Change-Id: I18a1740599c1104af3bbc58d43c3075741395eea
splash: use parameters provided by the fb driver

Certain parameters, such as screen resolution, differ between
monitors. Enhance the splash program to dynamically configure
itself.

Change-Id: Ia79acbf59ffb31c1a2f41d9c8b7de589a4a7e7cf