plat: imx8mm: Add the support for opteed spd on imx8mq/imx8mm

Add the basic support for opteed SPD on imx8mq & imx8mm.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: I6c4855c89dea78d13d172c3d86cf047f829e51ce
6 files changed