phy: Add USB3 PHY support to Google Tensor SoC USB PHY driver

Add USB3 PHY support for the Google Tensor G5 USB PHY driver.
This patch adds functionality for the usb3_tca register, usb3 clock,
and usb3 reset as defined in google,lga-usb-phy.yaml. Kconfig now lists
USB SuperSpeed support.

Refactor the probe sequence to initialize the USB2 and USB3 PHYs, and then
initialize clocks and resets for both PHYs afterwards.

Refactor set_vbus_valid to reduce duplicated code.

Implement USB3 phy_ops for phy_init, phy_exit, and phy_power_on.
combo_phy_state enum is added to track PHY bringup state across
PHY API calls. google_usb_set_orientation can reprogram the TCA when the
PHY is ready.

google_usb_set_orientation now calls pm_runtime_get_if_active to
guarantee register access. Setting orientation and pm_runtime management
are now handled within phy_mutex.

Signed-off-by: RD Babiera <rdbabiera@google.com>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Neill Kapron <nkapron@google.com>
Link: https://patch.msgid.link/20260925222959.3607769-2-rdbabiera@google.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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