llist: Add back llist_add_batch() and llist_del_first() prototypes

Commit 1230db8e1543 ("llist: Make some llist functions inline")
has deleted the definitions, causing problems for (not upstream yet)
code that tries to make use of them.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: David Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20111005172528.0d0a8afc65acef7ace22a24e@canb.auug.org.au
Signed-off-by: Ingo Molnar <mingo@elte.hu>