DT binding for MAC cells in fixed layout was upstream approved and
accepted. Add support for it. This can replace quite some of our
downstream hacks.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 61f674df4f0ce2b1c53b0b7f6b0c1d03d99838c0)
b649b0bf71