dt-bindings: mmc: imx-esdhc: Add imx93 compatible string

Add i.MX93 compatible string, it uses two compatible strings.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20220215081502.789067-1-peng.fan@oss.nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>