msm: ipa: Fix BAM register dump logic

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

Change-Id: I0eacb66535ecbf049b59521adf9f3ef65bbc97fc
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>