msm: ipa: debugfs improvements

No exception LAN packet count includes non-LAN packets and
makes it hard to know exactly how many LAN packets were
received at apps. This commit fixes that issue.

Change-Id: Ic4f1e396d1cc53dd5b6a7532cc0d43d76aab9af9
Signed-off-by: Ravi Gummadidala <rgummadi@codeaurora.org>