mb/google/brya/var/redrix: Enable SaGv support

Enable SaGv support for redrix

BUG=b:198536984
TEST=FW_NAME=redrix emerge-brya coreboot

Signed-off-by: Wisley Chen <wisley.chen@quanta.corp-partner.google.com>
Change-Id: I54402dfde5db4106a4e0d891c19592fda39a1099
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57432
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/google/brya/variants/redrix/overridetree.cb

@@ -18,6 +18,8 @@ fw_config
 	end
 end
 chip soc/intel/alderlake
+	register "SaGv" = "SaGv_Enabled"
+
 	# Intel Common SoC Config
 	#+-------------------+---------------------------+
 	#| Field             |  Value                    |