regmap: Updates for v6.6

This is a much quieter release than the past few, there's one small API
addition that I noticed a user for in ALSA and a bunch of cleanups:

 - Provide an interface for determining if a register is present in the
   cache and add a user of it in ALSA.
 - Full support for dynamic allocations, following the temporary bodges
   that were done as fixes in the previous release.
 - Remove the unused and questionably working 64 bit support.
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