treewide: Migrate CONFIG_FSL_ESDHC to Kconfig

Migrate the CONFIG_FSL_ESDHC option to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/mx25pdk_defconfig b/configs/mx25pdk_defconfig
index a780733..8620ad2 100644
--- a/configs/mx25pdk_defconfig
+++ b/configs/mx25pdk_defconfig
@@ -18,6 +18,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_DOS_PARTITION=y
 CONFIG_ENV_IS_IN_MMC=y
+CONFIG_FSL_ESDHC=y
 CONFIG_FS_EXT4=y
 CONFIG_FS_FAT=y
 CONFIG_OF_LIBFDT=y