Add support to enable/disable builtin GbE (again)

This requires a new system agent binary (v6 / v11 on haswell).
Note that the existing system agent binaries are long time obsolete
and won't work with current coreboot, so this update is overdue.

Change-Id: I48d8649576ca84d2b85ab082ce06f3462e189059
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/3568
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/mainboard/samsung/stumpy/romstage.c b/src/mainboard/samsung/stumpy/romstage.c
index dda3ab5..f64e860 100644
--- a/src/mainboard/samsung/stumpy/romstage.c
+++ b/src/mainboard/samsung/stumpy/romstage.c
@@ -183,6 +183,7 @@
 	};
 #endif
 	struct pei_data pei_data = {
+		pei_version: PEI_VERSION,
 		mchbar: DEFAULT_MCHBAR,
 		dmibar: DEFAULT_DMIBAR,
 		epbar: DEFAULT_EPBAR,