staging: dgap: fix sparse warnings for the entire cm_t structure

This patch fixes sparse warnings for the entire cm_t structure
This entire structure defines a hardware segment

Signed-off-by: Mark Hounschell <markh@compro.net>
Tested-by: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>