staging: hikey9xx: phy-hi3670-usb3.txt: use a consistent namespace

While this driver is not used yet, use a more consistent namespace,
similar to the PHY layer for Kirin 960 (hi3660).

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/49c2f648516e62d75d339edf42a029bac138e6c0.1600338981.git.mchehab+huawei@kernel.org


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