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/tqma6s_wru4_mmc_defconfig b/configs/tqma6s_wru4_mmc_defconfig
index 1d47006..1402c8d 100644
--- a/configs/tqma6s_wru4_mmc_defconfig
+++ b/configs/tqma6s_wru4_mmc_defconfig
@@ -9,3 +9,4 @@
 CONFIG_AUTOBOOT_STOP_STR_SHA256="36a9e7f1c95b82ffb99743e0c5c4ce95d83c9a430aac59f84ef3cbfab6145068"
 CONFIG_CMD_GPIO=y
 CONFIG_PCA9551_LED=y
+CONFIG_OF_LIBFDT=y