uboot-imx

MA-15813 [Android] imx8q: Enable reset in spl stage

To avoid both A/B slots are marked as unbootable because
of some random failures, we will need to reset at spl stage
when current slot load/verify fail but already with flag
"successful_boot" set.

imx8q can't be reset via the psci driver because the atf
is not avaiable at spl stage, porting the sc_pm_reboot()
scu api so we can do reset at spl stage for imx8qm/imx8qxp
mek boards.

Test: reset on imx8qm_mek and imx8qxp_mek.

Change-Id: Ifa0bdea9393e413942a8a0188a4f937fa0aa9ab8
Signed-off-by: Ji Luo <ji.luo@nxp.com>