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/P1020UTM-PC_36BIT_defconfig b/configs/P1020UTM-PC_36BIT_defconfig
index ace09b0..1bd8f7b 100644
--- a/configs/P1020UTM-PC_36BIT_defconfig
+++ b/configs/P1020UTM-PC_36BIT_defconfig
@@ -6,3 +6,4 @@
 CONFIG_E1000=y
 CONFIG_SYS_NS16550=y
 CONFIG_FSL_ESPI=y
+CONFIG_OF_LIBFDT=y