Revert "Make using open-source drivers such as Freedreno possible."

* Holy brainmelt Batman!  I've been trying to determine what is causing the constant crashes for days.  It's this.  The reason is that enabling KGSL_DRM disables KGSL_PER_PROCESS_PAGE_TABLE! This configuration will cause the address space to be quickly exhausted in a spectacular way.

* Please do not turn this back on unless you want to pay my psychiatrist bill!

This reverts commit 7a938217abd8b12e70c30bf00400fbb59dcd92a6

Signed-off-by: task650 <task650@gmail.com>