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

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

The USBDRD31 5nm controller consists of Synopsys USB2.0 femptophy and
USBSS combophy. Add-on USB20 femptophy is required to support USB20 data
rates along with USBSS phy. Document support for the USB2.0 femptophy
found on combophy of the this 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/20251124110453.2887437-4-pritam.sutar@samsung.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>