drm/i915: move NEEDS_FORCE_WAKE to i915_drv.c

commit b7d84096d3c45f4e397e913da4ce24ec9a32022e upstream.

It's only used by the main read/write functions, so we can keep it with
them.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>