Revert "msm: pcie: Fix for MDM enumeration issue"

This reverts commit 0e4399bc.
Delay is needed only in case of PCIe switch and not required
for normal case.

Change-Id: Ifa6317f7be1159b2ebc55f64fabcc47d450dc260
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>