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/mx6qarm2_defconfig b/configs/mx6qarm2_defconfig
index 925fc16..35f1d19 100644
--- a/configs/mx6qarm2_defconfig
+++ b/configs/mx6qarm2_defconfig
@@ -24,6 +24,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_ENV_IS_IN_MMC=y
+CONFIG_FSL_ESDHC=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_HOST_ETHER=y