MAINTAINERS, sched: Update file pattern

Took a while to sort out these bits and we'd like to be Cc:-ed on
future modifications to the waitqueue APIs and all that.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-0ix315c7qcz88slmnrpshvmf@git.kernel.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>