msm: pcie: remove PCIe PHY and PARF dump in linkdown

Do not dump PCIe PHY and PARF register space when there is
a linkdown. By the time PCIe receives the linkdown interrupt,
the reset for PCIe PHY has already happened, so these registers
do not have any meaningful value.

Change-Id: I8f66ab9375fd42573a895d5d872a3d2e1782adee
Signed-off-by: Tony Truong <truong@codeaurora.org>