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/opos6uldev_defconfig b/configs/opos6uldev_defconfig
index e1e8246..cff15a9 100644
--- a/configs/opos6uldev_defconfig
+++ b/configs/opos6uldev_defconfig
@@ -60,6 +60,7 @@
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MXC=y
 CONFIG_PWRSEQ=y
+CONFIG_FSL_ESDHC=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_MICREL=y
 CONFIG_NETDEVICES=y