msm: ipa3: read hw tables from debugfs

Add debugfs entries for reading filtering and routing tables
directly from IPA HW

Change-Id: I461766b649eda90e98ee1017700922ac6665bf00
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>