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/mx35pdk_defconfig b/configs/mx35pdk_defconfig
index 9f27c94..ef900ec 100644
--- a/configs/mx35pdk_defconfig
+++ b/configs/mx35pdk_defconfig
@@ -28,6 +28,7 @@
 CONFIG_BOOTP_GATEWAY=y
 CONFIG_BOOTP_SUBNETMASK=y
 CONFIG_MXC_GPIO=y
+CONFIG_FSL_ESDHC=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_NAND=y
 CONFIG_NAND_MXC=y