msm: rmnet_ipa: do not release resource on pending data

In case there is pending data submitted to IPA, IPA RM resource should
not be released. The resource release happens only when all packets were
processed by IPA.

CRs-Fixed: 1116262
Change-Id: I19756cbe4f84a5d09853d6066362e4a2c9ae1f73
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>