dt-bindings: trivial-devices: Add silabs,si3210

Add Silicon Labs SI3210 to trivial devices.
Signed-off-by: Vincent Tremblay <vincent@vtremblay.dev>
Link: https://lore.kernel.org/r/20221227141011.111410-1-vincent@vtremblay.devSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -325,6 +325,8 @@ properties:
           - sgx,vz89x
             # Silicon Labs EM3581 Zigbee SoC with SPI interface
           - silabs,em3581
+            # Silicon Labs SI3210 Programmable CMOS SLIC/CODEC with SPI interface 
+          - silabs,si3210
             # Relative Humidity and Temperature Sensors
           - silabs,si7020
             # Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply