staging: dgap: Remove unneeded code from dgap.c

This patch removes more unneeded code that was
supporting the old firmware loading process

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