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/P1020RDB-PD_defconfig b/configs/P1020RDB-PD_defconfig
index de333e8..fda0ced 100644
--- a/configs/P1020RDB-PD_defconfig
+++ b/configs/P1020RDB-PD_defconfig
@@ -27,6 +27,7 @@
 CONFIG_MTDIDS_DEFAULT="nor0=ec000000.nor"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=ec000000.nor:128k(dtb),6016k(kernel),57088k(fs),1m(vsc7385-firmware),1280k(u-boot)"
 CONFIG_ENV_IS_IN_FLASH=y
+CONFIG_FSL_ESDHC=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y