imx: imx8ulp: Get chip revision from Sentinel

In both SPL and u-boot, after probing the S400 MU, get the chip revision,
lifecycle and UID from Sentinel.
Update get_cpu_rev to use the chip revision not hard coded it for A0

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
4 files changed