Revert "drm/amdkfd: Fix spurious debug exception on gfx10"

This reverts commit ea368183

.

Needed due to conflicts when reverting "drm/amdkfd: Unify gfx9/gfx10
context save area layouts".

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>