mmc: sdhci-esdhc-imx: Convert the driver to DT-only

mmc: sdhci-esdhc-imx: Convert the driver to DT-only

commit 854a22997ad5d6c9860a2d695c40cd4004151d5b upstream.

Since 5.10-rc1 i.MX is a devicetree-only platform, so simplify the code
by removing the unused non-DT support.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://lore.kernel.org/r/20201117113750.25053-1-festevam@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>