wifi: remove unnecessary debug dump

Since design was adjusted, we are no longer need
to cat dump_start when bugreport be triggered.

Bug: 256746618
Test: Trigger bugreport and check debug files.
Change-Id: I907e707be99a35bfd76dfdb5f9bd693cb4b471d8
Signed-off-by: Roger Wang <wangroger@google.com>
2 files changed