linux-phytec-ti

drm/i915: Remove misleading comment around bind_to_vm

It's true that we might need to context switch, but both the signalling
and implementation of the same are a few source files away. Remove it.

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>