dt-bindings: trivial-devices: Add Infineon TDA38640 Voltage Regulator

Infineon TDA38640 is PMBUS compliant voltage regulator.
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230124202317.3704963-1-Naresh.Solanki@9elements.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -141,6 +141,8 @@ properties:
           - infineon,slb9645tt
             # Infineon SLB9673 I2C TPM 2.0
           - infineon,slb9673
+            # Infineon TDA38640 Voltage Regulator
+          - infineon,tda38640
             # Infineon TLV493D-A1B6 I2C 3D Magnetic Sensor
           - infineon,tlv493d-a1b6
             # Infineon Multi-phase Digital VR Controller xdpe11280