staging: hikey9xx: phy-hi3670-usb3: fix some issues at the init code

There are some problems at the initialization part of this phy.
Solve them.

Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/5080774c68784afed1183cb54f540350e0551b07.1600338981.git.mchehab+huawei@kernel.org


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