mesa3d: Gallium VC4 GPU driver for Raspberry Pi.

Using Eric Anholts MIT-licensed Mesa and kernel DRM driver
for the 2708 (aka the 2835), the chip that's in the Raspberry Pi.
http://anholt.livejournal.com/
http://dri.freedesktop.org/wiki/VC4/

Signed-off-by: Xerxes Rånby <xerxes@gudinna.com>