Staging: dt3155: remove DT_3155_* errno defines

Remove the DT_3155_{SUCCESS/FAILURE} errno defines and use the
kernel provided ones.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Scott Smedley <ss@aao.gov.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>