Revert "msm: ep_pcie: Disable clkreq interrupt and release wakelock in D3 cold"

This reverts commit 5a9939d3
Reverting change to unblock compilation error of missing variable
'ep_pcie_dev_wake' will pull back the changes with proper
dependent changes.

Change-Id: I4a1bb73743ba99cccb26b19c0d37c5b56ae74a59
Signed-off-by: Ajay Prathi <aprathi@codeaurora.org>