msm: kgsl: Fix the A3XX debugbus snapshot code

The code that dumped the A3XX debug bus wasn't using
the right bitshift for debug bus ID resulting in completely
incorrect data in the snapshot output. Set the ID correctly
and the debug data is full and complete.

Change-Id: Ic0dedbad41ec7267517f4fa16de2c5884ae0d82c
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>