mb/google/hades: Enable smbus in device tree

Hades uses the SODIMM, enable the smbus to see the SPD address for the
memory.

BUG=b:283138024
TEST=i2cdetect -l can see the smubs adapter.

Signed-off-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Change-Id: I3912a025afaf8388d04a4b08852a84d4a2a6bf06
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75399
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/baseboard/hades/devicetree.cb

@@ -119,5 +119,6 @@ chip soc/intel/alderlake
 			end
 		end
 		device ref hda on end
+		device ref smbus on end
 	end
 end