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/mx6sabreauto_defconfig b/configs/mx6sabreauto_defconfig
index bf34510..77958c8 100644
--- a/configs/mx6sabreauto_defconfig
+++ b/configs/mx6sabreauto_defconfig
@@ -41,6 +41,7 @@
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_SF=y
+CONFIG_FSL_ESDHC=y
 CONFIG_NAND=y
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y