mmc: core: Do not evaluate HS400 capabilities if bus has no MMC capability

If 'no-mmc' is set but 'no-mmc-hs400' is not, this warning is raised.
Specifying 'no-mmc' should be enough though.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20220614113905.1458715-1-alexander.stein@ew.tq-group.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>