staging: Add dgrp driver for Digi Realport devices

This is based on dgrp-1.9 available from
ftp://ftp1.digi.com/support/beta/linux/dgrp/dgrp-1.9.tgz

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/dgrp/Kconfig
Simple merge

diff --cc drivers/staging/dgrp/Makefile
Simple merge

diff --cc drivers/staging/dgrp/README
Simple merge

diff --cc drivers/staging/dgrp/TODO
Simple merge

diff --cc drivers/staging/dgrp/dgrp_common.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_common.h
Simple merge

diff --cc drivers/staging/dgrp/dgrp_dpa_ops.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_driver.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_mon_ops.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_net_ops.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_ports_ops.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_specproc.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_sysfs.c
Simple merge

diff --cc drivers/staging/dgrp/dgrp_tty.c
Simple merge

diff --cc drivers/staging/dgrp/digirp.h
Simple merge

diff --cc drivers/staging/dgrp/drp.h
Simple merge