Disable Vista compatibility for Sony VGN-NS50B_L.
https://bugzilla.kernel.org/show_bug.cgi?id=12904#c46

Note that this change is a workaround, not a permanent fix.
For the permanent fix is to figure out what compatibility
means and to actually be compatible...
Tested-by: NVoldemar <harestomper@gmail.com>
Signed-off-by: NZhang Rui <rui.zhang@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>