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/northbridge/intel/haswell/pei_data.h b/src/northbridge/intel/haswell/pei_data.h
index 280c73b..7c10e41 100644
--- a/src/northbridge/intel/haswell/pei_data.h
+++ b/src/northbridge/intel/haswell/pei_data.h
@@ -31,7 +31,7 @@
 #define PEI_DATA_H
 
 typedef void (*tx_byte_func)(unsigned char byte);
-#define PEI_VERSION 10
+#define PEI_VERSION 11
 
 struct pei_data
 {
@@ -53,6 +53,7 @@
 	uint8_t spd_addresses[4];
 	int boot_mode;
 	int ec_present;
+	int gbe_enable;
 	// 0 = leave channel enabled
 	// 1 = disable dimm 0 on channel
 	// 2 = disable dimm 1 on channel