ASoC: arizona: Move request of speaker IRQs into bus probe

It is more idiomatic to request all resources in the bus level probe,
this patch moves the request of the speaker thermal event IRQs from the
ASoC level probe into the bus level probe.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>