Convert CONFIG_FSL_USDHC to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_USDHC

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/imx8qm_rom7720_a1_4G_defconfig b/configs/imx8qm_rom7720_a1_4G_defconfig
index e944e69..fb43fa1 100644
--- a/configs/imx8qm_rom7720_a1_4G_defconfig
+++ b/configs/imx8qm_rom7720_a1_4G_defconfig
@@ -60,7 +60,7 @@
 CONFIG_I2C_MUX_PCA954x=y
 CONFIG_MISC=y
 CONFIG_SUPPORT_EMMC_BOOT=y
-CONFIG_FSL_ESDHC_IMX=y
+CONFIG_FSL_USDHC=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_ADDR_ENABLE=y
 CONFIG_PHY_ATHEROS=y