Add support for i.MXRT1050's sdhc.

Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: NJesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: NFabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20211125211443.1150135-12-Mr.Bossman075@gmail.comSigned-off-by: NUlf Hansson <ulf.hansson@linaro.org>