sched: Fix runtime accounting w/ split exec & sched contexts

Without proxy-exec, we normally charge the "current" task for
both its vruntime as well as its sum_exec_runtime.

With proxy, however, we have two "current" contexts: the
scheduler context and the execution context. We want to charge
the execution context rq->curr (ie: proxy/lock holder) execution
time to its sum_exec_runtime (so it's clear to userland the
rq->curr task *is* running), as well as its thread group.

However the rest of the time accounting (such a vruntime and
cgroup accounting), we charge against the scheduler context
(rq->donor) task, because it is from that task that the time
is being "donated".

If the donor and curr tasks are the same, then it's the same as
without proxy.

Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: K Prateek Nayak <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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