staging: hikey9xx: convert phy-kirin970-usb3.txt to yaml

Use the new YAML for this physical layer.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/03535ba996b3d82d522ce9c529bc2ce8e1d8d531.1600338981.git.mchehab+huawei@kernel.org


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