PCI/pwrctrl: generic: Add UPD720201/UPD720202 USB 3.0 xHCI Host Controller support

PCI/pwrctrl: generic: Add UPD720201/UPD720202 USB 3.0 xHCI Host Controller support

Enable the generic pwrctrl driver to control power of PCIe
UPD720201/UPD720202 USB 3.0 xHCI Host Controller.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260220-topic-sm8650-ayaneo-pocket-s2-base-v5-4-1ad79caa1efa@linaro.org