staging: olpc_dcon: drop support for DCON v1

The v1 DCONs only existed for XO-1 prototypes (and even then, very very
early prototypes).  Drop support for v1 DCON.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>