Convert CONFIG_FSL_USDHC to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_USDHC

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Add IMX8M, TARGET_S32V234EVB to FSL_USDHC list]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/s32v234evb_defconfig b/configs/s32v234evb_defconfig
index 9eaa894..7ccb9f1 100644
--- a/configs/s32v234evb_defconfig
+++ b/configs/s32v234evb_defconfig
@@ -11,7 +11,7 @@
 CONFIG_CMD_MEMTEST=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_DM=y
-CONFIG_FSL_ESDHC_IMX=y
+CONFIG_FSL_USDHC=y
 CONFIG_DM_SERIAL=y
 CONFIG_FSL_LINFLEXUART=y
 CONFIG_OF_LIBFDT=y