regmap: kunit: Add more cache-sync tests

Extend the testing of cache-sync.

- cache_sync() renamed cache_sync_marked_dirty() for clarity of
  what conditions it is testing.

- cache_sync_defaults() renamed cache_sync_defaults_marked_dirty()
  for clarity. Added code to write the register back to its default
  value to check that a dirty sync doesn't write out the default value.

- Added cache_sync_after_cache_only(). Tests syncing the cache without
  calling regcache_mark_dirty(). A register written while in cache-only
  should be written out by regcache_sync().

- Added cache_sync_default_after_cache_only. This is similar to
  cache_sync_after_cache_only(), but the register is changed to its
  default value while in cache-only. Because regcache_mark_dirty() was
  NOT called, regacache_sync() should write out the register.

Signed-off-by: Richard Fitzgerald <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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