msm: ipa: Fix BAM register dump logic for ipav3

APPS doesn't have access to dump BAM registers of Q6 pipes.
Make changes to print only IPA pipes connected to USB.

Change-Id: Ib199b33dd6987fdda0f8f2d77ffb1656153c33a2
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>