AGESA: Add OemCustomize hooks structure

We should potentially provide an OEM platform hook to manipulate parameters
around any entry point to AGESA. Use structure for such ops to avoid weak
functions and lots of empty function stubs.

Change-Id: I99bf7de8a1e2f183399d2216520a45d0c24fd64c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7824
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
diff --git a/src/mainboard/lippert/toucan-af/PlatformGnbPcie.c b/src/mainboard/lippert/toucan-af/PlatformGnbPcie.c
index 3584280..16d1b4a 100644
--- a/src/mainboard/lippert/toucan-af/PlatformGnbPcie.c
+++ b/src/mainboard/lippert/toucan-af/PlatformGnbPcie.c
@@ -45,10 +45,8 @@
  *
  **/
 /*---------------------------------------------------------------------------------------*/
-VOID
-OemCustomizeInitEarly (
-	IN	OUT AMD_EARLY_PARAMS	*InitEarly
-	)
+
+static AGESA_STATUS OemInitEarly(AMD_EARLY_PARAMS * InitEarly)
 {
 	AGESA_STATUS		 Status;
 	VOID				 *BrazosPcieComplexListPtr;
@@ -144,4 +142,9 @@
 
 	InitEarly->GnbConfig.PcieComplexList = BrazosPcieComplexListPtr;
 	InitEarly->GnbConfig.PsppPolicy		= 0;
+	return AGESA_SUCCESS;
 }
+
+const struct OEM_HOOK OemCustomize = {
+	.InitEarly = OemInitEarly,
+};