phy: qcom-qmp-combo: rename common-register pointers

phy: qcom-qmp-combo: rename common-register pointers

The common registers are shared by the USB and DP parts of the PHY so
drop the misleading "dp" prefix from the corresponding pointers.

Note that the "DP" prefix could also be dropped from the corresponding
defines, but leave that in place for now.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221121085058.31213-12-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>