tests/testdisplay.c: make the 3th pipe finish all the mode setting.

If test all modes rather than preferred mode, remove framebuffer and
set CRTC to zero after each connector mode setting.

Signed-off-by: Sun Yi <yi.sun@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
1 file changed