dt-bindings: phy: convert rockchip-usb-phy.txt to YAML

Current dts files with Rockchip 'usbphy' nodes are manually verified.
In order to automate this process rockchip-usb-phy.txt has to be
converted to YAML.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210518165658.12764-2-jbx6244@gmail.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>