gpu: host1x: Add MIPI pad calibration support

This driver adds support to perform calibration of the MIPI pads for CSI
and DSI.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --cc drivers/gpu/host1x/Makefile
Simple merge

diff --cc drivers/gpu/host1x/dev.c
Simple merge

diff --cc drivers/gpu/host1x/dev.h
Simple merge

diff --cc drivers/gpu/host1x/mipi.c
Simple merge

diff --cc include/linux/host1x.h
Simple merge