mb/google/brya/var/felwinter: Enable SaGv

Enable SaGv.

BUG=b:198235324
TEST=Boot into without issues.

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I3cbff8d28bb5b5bfdad323f348b9f880245d049d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59095
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

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

@@ -7,7 +7,7 @@ fw_config
 end
 
 chip soc/intel/alderlake
-	register "SaGv" = "SaGv_Disabled"
+	register "SaGv" = "SaGv_Enabled"
 
 	# FIVR configurations for brya are disabled since the board doesn't have V1p05 and Vnn
 	# bypass rails implemented.