phy: qcom: qmp: split DP PHY registers to separate headers

Split the DP PHY register definitions to separate headers, removing them
from the global one.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240126-phy-qmp-merge-common-v2-4-a463d0b57836@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>