msm: ipa3: fix to read hw tables from debugfs

Fix to IPA driver debugfs logic to read filtering
and routing directly from HW.

CRs-Fixed: 1020271
Change-Id: I6bb5f9a01e3f41107d7b5bdf7c19557546573463
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>