cnss2: Add CNSS wrapper function for msm_pcie_reg_dump()

Add CNSS wrapper function for msm_pcie_reg_dump() which is a
MSM PCIe specific API. It will also facilitate to support third
party attachment for upcoming targets.

Change-Id: I21b767323aae65d9dc02b628ee54c2c2e115524b
Signed-off-by: Mohammed Siddiq <msiddiq@codeaurora.org>
Signed-off-by: Yue Ma <yuem@codeaurora.org>