drivers: phy: qcom: ipq806x-usb: convert to BITFIELD macro

Convert some define to BITFIELD macro to tidy things up.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20220117002641.26773-1-ansuelsmth@gmail.com


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