dt-bindings: phy: samsung,usb3-drd-phy: add ExynosAutov920 combo ssphy

dt-bindings: phy: samsung,usb3-drd-phy: add ExynosAutov920 combo ssphy

The USBDRD31 5nm controller consists of Synopsys USB20 femptoPhy and
USB31 SSP+ combophy. Document support for the USB31 SSP+ phy found on
combophy of the ExynosAutov920 SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Pritam Manohar Sutar <pritam.sutar@samsung.com>
Link: https://patch.msgid.link/20251124110453.2887437-6-pritam.sutar@samsung.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>