mmc: sdhci: Update MAINTAINERS Maintained -> Supported

Currently, status is "Supported" not "Maintained" for SDHCI and CQHCI.
Amend MAINTAINERS accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20220815105905.65188-1-adrian.hunter@intel.com


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