liu,lei authored Apr 09, 2015 and Daniel Vetter committed Apr 09, 2015

Debugfs i915_fbc_status shows "FBC unsupported on this chipset"
not "unsupported by this chipset" if the platform doesn't support
FBC feature. That typo will cause case fail on some platforms such
as byt, bsw.

Signed-off-by: Lei Liu <lei.a.liu@intel.com>