kgsl: remove postmortem
msm: kgsl: Remove adreno postmortem

All the cool kids use snapshot now so remove adreno postmortem and
associated functionality.  Sorry postmortem - I think we should see
other people.  Its not you, its me. I've grown up.

Change-Id: Ic0dedbadf461ebab439c91068a0c43e1de74b74b
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>