mb/google/rex/var/kanix: Enable CNVI WLAN based on fw_config

BUG=b:377377766
TEST=emerge-rex coreboot pass

Change-Id: Ibdf01e16267aa64bcf376001e108e2eaa677aaa6
Signed-off-by: Tyler Wang <tyler.wang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85534
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/rex/variants/kanix/overridetree.cb

@@ -381,6 +381,16 @@ chip soc/intel/meteorlake
 				end
 			end
 		end
+		device ref cnvi_wifi on
+			chip drivers/wifi/generic
+				register "wake" = "GPE0_PME_B0"
+				register "add_acpi_dma_property" = "true"
+				register "enable_cnvi_ddr_rfim" = "true"
+				device generic 0 on
+					probe WIFI_TYPE WIFI_CNVI
+				end
+			end
+		end
 		device ref ipu on
 			chip drivers/intel/mipi_camera
 				register "acpi_uid" = "0x50000"