dt-bindings: phy: samsung,usb3-drd-phy: Add exynos990 compatible

Add a compatible for the exynos990-usbdrd-phy. The PHY is compatible with
the older exynos5420 design (two clocks) when running in highspeed mode.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Igor Belwon <igor.belwon@mentallysanemainliners.org>
Link: https://lore.kernel.org/r/20250515-usb-resends-may-15-v3-1-ad33a85b6cee@mentallysanemainliners.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>