mmc: fsl_esdhc: add compatible for fsl, imxrt-usdhc

Add compatible "fsl,imxrt-usdhc" to make mmc working on i.MXRT platforms
with CONFIG_DM_MMC=y.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 85fd190..2bc19dd 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -732,7 +732,7 @@
 
 config FSL_USDHC
 	bool "Freescale/NXP i.MX uSDHC controller support"
-	depends on MX6 || MX7 ||ARCH_MX7ULP || IMX8 || IMX8M || TARGET_S32V234EVB
+	depends on MX6 || MX7 ||ARCH_MX7ULP || IMX8 || IMX8M || IMXRT || TARGET_S32V234EVB
 	select FSL_ESDHC_IMX
 	help
 	  This enables the Ultra Secured Digital Host Controller enhancements
diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c
index 3416e9b..96fe01e 100644
--- a/drivers/mmc/fsl_esdhc_imx.c
+++ b/drivers/mmc/fsl_esdhc_imx.c
@@ -78,7 +78,7 @@
 	uint    vendorspec;
 	uint    mmcboot;
 	uint    vendorspec2;
-	uint    tuning_ctrl;	/* on i.MX6/7/8 */
+	uint    tuning_ctrl;	/* on i.MX6/7/8/RT */
 	char	reserved5[44];
 	uint    hostver;	/* Host controller version register */
 	char    reserved6[4];	/* reserved */
@@ -1660,6 +1660,7 @@
 	{ .compatible = "fsl,imx8mm-usdhc", .data = (ulong)&usdhc_imx8qm_data,},
 	{ .compatible = "fsl,imx8mn-usdhc", .data = (ulong)&usdhc_imx8qm_data,},
 	{ .compatible = "fsl,imx8mq-usdhc", .data = (ulong)&usdhc_imx8qm_data,},
+	{ .compatible = "fsl,imxrt-usdhc", },
 	{ .compatible = "fsl,esdhc", },
 	{ /* sentinel */ }
 };