spi: Fixes for v6.8

There's two things here - the big one is a batch of fixes for the power
management in the Cadence QuadSPI driver which had some serious issues
with runtime PM and there's also a revert of one of the last batch of
fixes for ppc4xx which has a dependency on -next but was in between two
mainline fixes so the -next dependency got missed.

The ppc4xx driver is not currently included in any defconfig and has
dependencies that exclude it from allmodconfigs so none of the CI
systems catch issues with it, hence the need for the earlier fixes
series.  There's some updates to the PowerPC configs to address this.
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