dwc3: gadget: Add debug event for pull up operation

This change adds debug event to capture pull up operation request.
It also captures if software fails to perfrom pull-up operation
here.

CRs-Fixed: 1036037
Change-Id: I77ecff3a2ac395ff3799c1b0618fbc7f5eeb03da
Signed-off-by: Mayank Rana <mrana@codeaurora.org>