Add i.MX8MM EVK board support
LPDDR4 code is still keep in old coding style to ease updating
if there is no code released.
dts is synced from kernel with sd2 regulator start up delay and off on
delay added.
Signed-off-by: Peng Fan
(cherry picked from commit 01b3f229b188e28b0887c0b32f66e939a50d3a69)
Signed-off-by: Ye Li