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/MPC8536DS_36BIT_defconfig b/configs/MPC8536DS_36BIT_defconfig
index 9821fed..999d776 100644
--- a/configs/MPC8536DS_36BIT_defconfig
+++ b/configs/MPC8536DS_36BIT_defconfig
@@ -25,6 +25,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_SYS_FSL_DDR2=y
+CONFIG_FSL_ESDHC=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y