phy: qcom-qmp: rename common registers

A plenty of DP PHY registers are common between V3 and V4. To simplify
V4 code, rename all common registers.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20210331151614.3810197-5-dmitry.baryshkov@linaro.org


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