dt-bindings: phy: google: Add Google Tensor G5 USB PHY

dt-bindings: phy: google: Add Google Tensor G5 USB PHY

Document the device tree bindings for the USB PHY interfaces integrated
with the DWC3 controller on Google Tensor SoCs, starting with G5
generation (Laguna). The USB PHY on Tensor G5 includes two integrated
Synopsys PHY IPs: the eUSB 2.0 PHY IP and the USB 3.2/DisplayPort combo
PHY IP.

Due to a complete architectural overhaul in the Google Tensor G5, the
existing Samsung/Exynos USB PHY binding for older generations of Google
silicons such as gs101 are no longer compatible, necessitating this new
device tree binding.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Roy Luo <royluo@google.com>
Link: https://patch.msgid.link/20251227-phyb4-v10-1-e8caf6b93fe7@google.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>