mainboard/intel/leafhill: Clean up

This patch tries to clean the code by:
o removing duplication of LPC GPIO pads
o removing incorrect definitions from devicetree
o removing irrelevant entries from FMD file

Also adds vital defaults in Kconfig so it is possible to build an image.

Change-Id: Id9913f3b053189166392271152ce5300d82a7de8
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/18479
Tested-by: build bot (Jenkins)
diff --git a/src/mainboard/intel/leafhill/Makefile.inc b/src/mainboard/intel/leafhill/Makefile.inc
index 9e3e892..c3077e7 100644
--- a/src/mainboard/intel/leafhill/Makefile.inc
+++ b/src/mainboard/intel/leafhill/Makefile.inc
@@ -1,3 +1,4 @@
 bootblock-y += bootblock.c
 
+romstage-y += romstage.c
 ramstage-y += mainboard.c