[POWERPC] spusched: Switch from workqueues to kthread + timer tick

Get rid of the scheduler workqueues that complicated things a lot to
a dedicated spu scheduler thread that gets woken by a traditional
scheduler tick.  By default this scheduler tick runs a HZ * 10, aka
one spu scheduler tick for every 10 cpu ticks.

Currently the tick is not disabled when we have less context than
available spus, but I will implement this later.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Jeremy Kerr <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>

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