Revert "msm: kgsl: implement server-side waits"

I should have known that this commit was the cause of the famous 4.3 deadlocks.
It's a shame because there are a few cool and interesting commits in the whole
package.

This reverts commit 39e8a4924cd1d92186c55ce61a46901c250289b1.
Merge remote-tracking branch 'upstream/nightlies-4.3-JWR' into sm-4.3-JWR