msm: ipa: fix TAG packet handling

In case that packet arrived with unexpected TAG, ignore the TAG field
and continue processing the packet as usual.

Change-Id: I6f026680ad2c4e43d82a9a0dc2b46fd6b27431e4
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Ravit Katzav <rkatzav@codeaurora.org>