drm/udl: rip out set_need_resched

This very much looks like copypasta from drm/i915's fault handler.
It was used there to duct-tape over issues around gpu reset handling.

Since that can't ever happen for udl and there's seemingly no other
reason for this just drop it.

Reported-by: Peter Zijlstra <[e-mail]>
Acked-by: Peter Zijlstra <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/udl/udl_gem.c

···
 	ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
 	switch (ret) {
 	case -EAGAIN:
-		set_need_resched();
 	case 0:
 	case -ERESTARTSYS:
 		return VM_FAULT_NOPAGE;