drm/i915/vlv: use W_SYNC_SHIFT for interlaced modes on VLV
drm/i915/vlv: use W_SYNC_SHIFT for interlaced modes on VLV

This makes HDMI testers happier on VLV platforms.  It may be that we
need it for any non-SVO platform, but I don't have any tests to back
that up, so I'm leaving other pre-ILK platforms alone for now.

Tested-by: "Clint Taylor <1536f9fb9de75b7cb0f9734bd641e55743b5e313@intel.com>"
Signed-off-by: Jesse Barnes <bc7add126c2dbb8382bf1c28ac262b9363a32706@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <cd6e8d405ca90be3a03d5427c5b24fbd2d68dcc4@linux.intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74964
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs