msm: pcie: Revert "scale CX and rate change after DRV resume"

This reverts commit 603d76db.

This change is already present in the snapshot. This revert
will remove duplicate code.

Change-Id: Id4588031a93c041a9480ac8ef33b6d177a4a2477
Signed-off-by: Tony Truong <truong@codeaurora.org>