drm/i915: enable lvds pin pairs before dpll on gen2

drm/i915: enable lvds pin pairs before dpll on gen2

commit 5b5896e4e1f353ef3dbc4e4e9ee44d53ccf105d7 upstream.

Otherwise things migt not work too well.

Breakage introduced in

commit eb1cbe4848b01f9f073064377875bc7d71eb401b
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Mar 28 23:12:16 2012 +0200

    drm/i915: split PLL update code out of i9xx_crtc_mode_set

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>