dwc3-msm: Don't fail USB LPM sequence if IN_L2 error is seen

In some instance it is being observed that USB controller is not
putting HSPHY into suspend state which results into IN_L2 error
and aborts USB low power mode. Not going into IN_L2 error is not
error fatal, hence continue with USB low power mode if this
error is seen.

Change-Id: I85f3567bdc897fbfffbbe95dec45d52d36106b06
Signed-off-by: Mayank Rana <mrana@codeaurora.org>