phy: qcom-qmp-ufs: split UFS-specific v2 PCS registers to a separate header

Follow other QMP headers, split and rename UFS-specific PCS registers to
ease comparing regs differences.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20221110192248.873973-7-dmitry.baryshkov@linaro.org


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