Follow the correct pipe vs port disable sequence for the PCH LVDS
ports, ie. disable the port after the pipe.

Other PCH port were already converted in the following commits:
 1ea56e26 drm/i915: Disable CRT port after pipe on PCH platforms
 3c65d1d1 drm/i915: Disable SDVO port after the pipe on PCH platforms
 a4790cec drm/i915: Disable HDMI port after the pipe on PCH platforms
 08aff3fe drm/i915: Move DP port disable to post_disable for pch platforms
but LVDS was forgotten.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>