mainboard/*/romstage.c: Sanitize system header inclusions

Fix system include paths to be consistent. Chipset support is
part of the Coreboot 'system' and hence 'non-local' (i.e., in
the same directory or context). One possible product of this, is
to perhaps allow future work to do pre-compiled headers (PCH) on
the buildbot for faster build times. However, this currently just
makes mainboard's consistent.

Change-Id: I2f3fd8a3d7864926461c960ca619bff635d7dea5
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/8085
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/src/mainboard/soyo/sy-6ba-plus-iii/romstage.c b/src/mainboard/soyo/sy-6ba-plus-iii/romstage.c
index 531e223..ca02936 100644
--- a/src/mainboard/soyo/sy-6ba-plus-iii/romstage.c
+++ b/src/mainboard/soyo/sy-6ba-plus-iii/romstage.c
@@ -24,11 +24,11 @@
 #include <device/pnp_def.h>
 #include <stdlib.h>
 #include <console/console.h>
-#include "southbridge/intel/i82371eb/i82371eb.h"
-#include "northbridge/intel/i440bx/raminit.h"
+#include <southbridge/intel/i82371eb/i82371eb.h>
+#include <northbridge/intel/i440bx/raminit.h>
 #include "drivers/pc80/udelay_io.c"
 #include "lib/delay.c"
-#include "cpu/x86/bist.h"
+#include <cpu/x86/bist.h>
 #include <superio/ite/it8671f/it8671f.h>
 #include <lib.h>