msm: pcie: add PCIe register dump for unexpected link down

Having PCIe PHY and PARF register dump is useful when there
is an unexpected link down. Add PCIe PHY and PARF dump when
there is an unexpected link down.

Change-Id: Iabaf113ef4d66ee0670c9c7d1535de65fa6309d6
Signed-off-by: Tony Truong <truong@codeaurora.org>