POWER4 oprofile updates from Carl Love.

- Create mmcr0, mmcr1, mmcra oprofilefs files.
- Use kernel and user profile disable bits. (Some modifications by me)
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>