drm/i915: Disable LVDS port after the pipe on PCH

drm/i915: Disable LVDS port after the pipe on PCH

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:
 dbbff20d02081688f22af15e7ed3937b6016c36e drm/i915: Disable CRT port after pipe on PCH platforms
 8987af580fba613a645bfdb72781d9af718682d7 drm/i915: Disable SDVO port after the pipe on PCH platforms
 f9bc9055b4162f10d6bca54fd3aabefddcac5b3b drm/i915: Disable HDMI port after the pipe on PCH platforms
 13de333e4c0e860607975b9af59359b0591a7b5c 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>