drbd: Move string function prototypes from linux/drbd.h to drbd_string.h

Signed-off-by: Andreas Gruenbacher <agruen@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>

diff --cc drivers/block/drbd/drbd_int.h
Simple merge

diff --cc drivers/block/drbd/drbd_strings.c
Simple merge

diff --cc drivers/block/drbd/drbd_strings.h
Simple merge

diff --cc include/linux/drbd.h
Simple merge