mb/intel/{saddlebrook,kunimitsu}: Add macro for SaGv config

Change-Id: Ia31da9997ba46c15cd385bf55e009cf299848b64
Signed-off-by: Praveen Hodagatta Pranesh <praveenx.hodagatta.pranesh@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36423
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/intel/kunimitsu/devicetree.cb b/src/mainboard/intel/kunimitsu/devicetree.cb
index 670a474..ea35785 100644
--- a/src/mainboard/intel/kunimitsu/devicetree.cb
+++ b/src/mainboard/intel/kunimitsu/devicetree.cb
@@ -34,7 +34,7 @@
 	register "SkipExtGfxScan" = "1"
 	register "Device4Enable" = "1"
 	register "HeciEnabled" = "0"
-	register "SaGv" = "3"
+	register "SaGv" = "SaGv_Enabled"
 	register "PmTimerDisabled" = "1"
 
 	register "pirqa_routing" = "PCH_IRQ11"