tip: demise of tsk_cpus_allowed() and tsk_nr_cpus_allowed()

[Mike Galbraith]

Hi Ingo,

Doing my ~daily tip merge of -rt, I couldn't help noticing $subject, as
they grow more functionality in -rt, which is allegedly slowly but
surely headed toward merge.  I don't suppose they could be left intact?
 I can easily restore them in my local tree, but it seems a bit of a
shame to whack these integration friendly bits.

	-Mike