Kill lvds_num_lanes

Only one value would work with corresponding gma code currently (which one
depends on board). Going forward, it's possible to compute which number can
be used, so there is no need to keep this info around.

Change-Id: Iadc77ef94b02f892860e3ae8d70a0a792758565d
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/11862
Tested-by: build bot (Jenkins)
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/drivers/intel/gma/i915.h

@@ -289,7 +289,6 @@ struct i915_gpu_controller_info
 {
 	int use_spread_spectrum_clock;
 	int link_frequency_270_mhz;
-	int lvds_num_lanes;
 	u32 backlight;
 	int ndid;
 	u32 did[5];