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

This reverts commit 55bf2b11cd7ae4f8dc277c6564268f838e34fe7d.
Revert "msm: kgsl: use kgsl_mmu_device_setstate() if the GPU is already idle"

This reverts commit e271b1ae537a339ead13cf76682d9761fb570029.
Revert "msm: mdp: Update sync pt. behaviour"

This reverts commit 965593062c97917117c0142081cf9285ed35fa29.