runqueue: Optimise task id string manipulations

Some task id manipulations were suboptimal:

* taskfn_fromtid and fn_from_tid were effectively the same function
* many calls to split_tid(), then taskfn_fromtid()
* taskfn_fromtid() called split_tid() internally

This patch adds split_tid_mcfn() to replace split_tid() and returns the
"taskfn" variant being used in many places. We update all core calls
to the new function and ignore the return values we don't need since the
function call overhead of the split_tid wrapper is higher than ignoring
a return value.

The one remaining standalone use of taskfn_fromtid is replaced with
fn_from_tid. I couldn't see any external usage so it was dropped.

There is external usage of split_tid so a wrapper remains for it.

Combined together these changes should improve some of the runqueue task
manipulation performance.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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