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

Enable SaGv support for crota

BUG=b:229600878
TEST=FW_NAME=crota emerge-brya coreboot

Signed-off-by: Terry Chen <terry_chen@wistron.corp-partner.google.com>
Change-Id: Ibc06ef19e9fbbc91ef650a4ac060ce2b7c5c25d3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64444
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

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

@@ -18,7 +18,7 @@ fw_config
 end
 
 chip soc/intel/alderlake
-
+	register "sagv" = "SaGv_Enabled"
 	register "max_dram_speed_mts" = "4800"
 	register "cnvi_bt_audio_offload" = "1"