Make IM pins optionnal

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Add HX8369 Driver, to merge with HX8357 one.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Add Brian's dt

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Patched hx8357 driver, also devicetree changes for displays added.