dt-bindings: trivial-devices: Add silabs,em3581

Add Silicon Labs EM3581 Zigbee SoC to trivial-devices.
Signed-off-by: Vincent Tremblay <vincent@vtremblay.dev>
Link: https://lore.kernel.org/r/20221227023550.569547-1-vincent@vtremblay.devSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -323,6 +323,8 @@ properties:
           - sensortek,stk8ba50
             # SGX Sensortech VZ89X Sensors
           - sgx,vz89x
+            # Silicon Labs EM3581 Zigbee SoC with SPI interface
+          - silabs,em3581
             # Relative Humidity and Temperature Sensors
           - silabs,si7020
             # Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply