FROMGIT: dt-bindings: phy: realtek: Add Realtek DHC RTD SoC USB 2.0 PHY

Document the USB PHY bindings for Realtek SoCs.
Realtek DHC (digital home center) RTD SoCs support DWC3 XHCI USB
controller and using USB 2.0 PHY transceiver.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230725033318.8361-4-stanley_chang@realtek.com


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

Bug: 286930662
(cherry picked from commit 612ad27a
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)
Change-Id: I338ac63f15c10687d79b98a6c68f8901b07869a5
Signed-off-by: Stanley Chang <stanley_chang@realtek.com>