gru: add user request to specify gru slice

Add a user request to specify the gru instruction slice parameter for user
contexts.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc drivers/misc/sgi-gru/grufault.c
Simple merge

diff --cc drivers/misc/sgi-gru/grulib.h
Simple merge

diff --cc drivers/misc/sgi-gru/grumain.c
Simple merge

diff --cc drivers/misc/sgi-gru/grutables.h
Simple merge