w1: add touch block command

Writes and returns sampled data back to userspace.

Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc drivers/w1/w1.h
Simple merge

diff --cc drivers/w1/w1_io.c
Simple merge

diff --cc drivers/w1/w1_netlink.c
Simple merge

diff --cc drivers/w1/w1_netlink.h
Simple merge