staging: hikey9xx: phy-hi3670-usb3: use bitfield macros

Cleanup the bitfield macros by using FIELD_PREP() and GENMASK().

While here, place all hexadecimal values in lowercase.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/ac56b97a99ec278d2f40e07e7e07adef36d45d09.1611052729.git.mchehab+huawei@kernel.org


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