mx31: add dma and fb devices

This adds the dma (ipu_dma) and fb devices for the mx31 for which drivers now are
available.

v2: merge the ipu and fb device in the same patch as suggested by Sascha

Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

diff --cc arch/arm/mach-mx3/devices.c
Simple merge

diff --cc arch/arm/mach-mx3/devices.h
Simple merge

diff --cc arch/arm/mach-mx3/mx31moboard.c
Simple merge