soc: imx8mq: Read SOC revision from TF-A

SOC revision on older imx8mq is not available in fuses so on anything
other than B1 current code just reports "unknown".

TF-A already handles this by parsing the ROM and exposes the value
through a SMC call. Call this instead of reimplementing the workaround
in the kernel itself.

Signed-off-by: Leonard Crestez <[email protected]>
Reviewed-by: Abel Vesa <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

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