MLK-20574 imx8mm: Support 3bits SPEED_GRADE fuse

The imx8mm new fuse map uses 3bits SPEED_GRADE and add 2Ghz speed.

SPEED SPEED_GRADE
2000 ’100’
1800 ’011’
1600 ’010’
1200 ’001’
800  ’000’

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit d747d5e2d055b1191166f5bf3395f7933023b323)
1 file changed