drm/i915: Restore has_fbc=1 for ILK-M

drm/i915: Restore has_fbc=1 for ILK-M

Restore the lost has_fbc flag for mobile ILK.

Cc: Carlos Santa <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Fixes: a13233804686 ("drm/i915: Introduce GEN5_FEATURES for device info")
Signed-off-by: Ville Syrjälä <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Rodrigo Vivi <[email protected]>
(cherry picked from commit c2d1a0ced2603c4a17fa9c53c37e415905cf5a6d)
Signed-off-by: Jani Nikula <[email protected]>