staging: dgnc: removes proc code

This patch removes the dgnc_proc.c and dgnc_proc.h files and all
references to proc functions in dgnc_driver.c. This also removes proc.h
from the include headers in driver.c, mgmt.c and sysfs.c and proc.o
from the Makefile.

Drivers now use sysfs instead of proc.

Signed-off-by: Lidza Louina <lidza.louina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>