[PATCH] random: make CCISS use add_disk_randomness

Disk devices should use the add_disk_randomness API rather than
SA_SAMPLE_RANDOM.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>