In the CEA-861 specification VIC 64 specifies a vsync pulse of 5 and
a backporch of 36. Adjust vsync pulse width to match specification.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NClint Taylor <clinton.a.taylor@intel.com>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1471282288-30909-1-git-send-email-clinton.a.taylor@intel.com