gpu: ipu-v3: Add SMFC code

The Sensor Multi Fifo Controller (SMFC) is used as a buffer between
the two CSIs (writing simultaneously) and up to four IDMAC channels.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --cc drivers/gpu/ipu-v3/Makefile
Simple merge

diff --cc drivers/gpu/ipu-v3/ipu-common.c
Simple merge

diff --cc drivers/gpu/ipu-v3/ipu-prv.h
Simple merge

diff --cc drivers/gpu/ipu-v3/ipu-smfc.c
Simple merge

diff --cc include/video/imx-ipu-v3.h
Simple merge