radeon: remove redundant __list_for_each definition from mkregtable.c

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>