When working with SM config mx9{4,5,52}evkrpmsg, mcores are not booted
by ROM. Hence, power on the mcore and initialize TCM ECC in u-boot for
subsequent mcore booting.
Signed-off-by: Ye Li <ye.li@nxp.com>
[fabio: Adapted to mainline context]
Signed-off-by: Fabio Estevam <festevam@gmail.com>