Move CONFIG_OF_LIBFDT to Kconfig

Move this option to Kconfig and tidy up existing boards.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/controlcenterd_36BIT_SDCARD_defconfig b/configs/controlcenterd_36BIT_SDCARD_defconfig
index c30dfae..7f52711 100644
--- a/configs/controlcenterd_36BIT_SDCARD_defconfig
+++ b/configs/controlcenterd_36BIT_SDCARD_defconfig
@@ -12,3 +12,4 @@
 CONFIG_FSL_ESPI=y
 CONFIG_TPM_AUTH_SESSIONS=y
 CONFIG_TPM=y
+CONFIG_OF_LIBFDT=y