phy: qcom-qmp-pcie: split pcs_misc region for ipq6018 pcie gen3

Follow the example of other PCIe PHYs and use separate pcs_misc region
to access PCS_PCIE_* resources.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220705094320.1313312-5-dmitry.baryshkov@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>