mb/google/fatcat/var/lapis: Enable SMBus controller

The SMBus controller was previously disabled on the Lapis variant.
Enable the SMBus device in the overridetree to allow the system to
communicate with onboard peripherals like the SPD EEPROMs and
thermal sensors.

BUG=none
TEST=Build and boot on Lapis; verify smbus is initialized.

Change-Id: I9d7254b6c2686ec67392294d45b870e3670f2aca
Signed-off-by: Pranava Y N <pranavayn@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91196
Reviewed-by: Avi Uday <aviuday@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/fatcat/variants/lapis/overridetree.cb

@@ -517,6 +517,7 @@ chip soc/intel/pantherlake
 				end
 			end
 		end # SNDW
+		device ref smbus on end
 		device ref i2c0 on end
 		device ref i2c3 on
 			chip drivers/i2c/tpm