qeth: bridgeport support - basic control

Introduce functions to assign roles and check state of bridgeport-capable
HiperSocket devices, and sysfs attributes providing access to these
functions from userspace. Introduce udev events emitted when the state
of a bridgeport device changes.

Signed-off-by: Eugene Crosser <eugene.crosser@ru.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc Documentation/s390/qeth.txt
Simple merge

diff --cc drivers/s390/net/Makefile
Simple merge

diff --cc drivers/s390/net/qeth_core.h
Simple merge

diff --cc drivers/s390/net/qeth_core_main.c
Simple merge

diff --cc drivers/s390/net/qeth_core_mpc.c
Simple merge

diff --cc drivers/s390/net/qeth_core_mpc.h
Simple merge

diff --cc drivers/s390/net/qeth_l2.h
Simple merge

diff --cc drivers/s390/net/qeth_l2_main.c
Simple merge

diff --cc drivers/s390/net/qeth_l2_sys.c
Simple merge