phy: qcom-qmp: move PCS V4 registers to separate headers

Move PCS V4 registers to the separate headers.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220705094320.1313312-16-dmitry.baryshkov@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>