MT8173 EVB support official kernel

Signed-off-by: James Kung <james.kung@linaro.org>
Tested-by: James Kung <james.kung@linaro.org> (MT8173 EVB)
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>