FROMGIT: dt-bindings: phy: realtek: Add Realtek DHC RTD SoC USB 3.0 PHY

Document the USB PHY bindings for Realtek SoCs.
Realtek DHC (digital home center) RTD SoCs support DWC3 XHCI USB
controller and using USB 3.0 PHY transceiver.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230725033318.8361-5-stanley_chang@realtek.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 286930662
(cherry picked from commit d6ef6887
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)
Change-Id: Ic16e843003c090d5f2ccee6881133a9f782b0c72
Signed-off-by: Stanley Chang <stanley_chang@realtek.com>