drm/i915: No need to put forcewake after a reset

As we now have intel_uncore_forcewake_reset() no need
to do explicit put after reset.

v2: rebase

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