uboot-phytec

arm: imx: add ipu to imx53.dts and set dm-pre-reloc

The ipu node in imx53 is needed for DM_VIDEO. We also need to set
u-boot,dm-pre-reloc to initialize before relocation.

Signed-off-by: Steffen Dirkwinkel <s.dirkwinkel@beckhoff.com>