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regmap: reg_default_cb for flat cache defaults
Merge series from "Sheetal ." <sheetal@nvidia.com>: This series adds a reg_default_cb callback for REGCACHE_FLAT to provide defaults for registers not listed in reg_defaults. Defaults are loaded eagerly during regcache init and the callback can use writeable_reg to filter valid addresses and avoid holes. Tegra ASoC drivers set reg_default_cb and add writeable_reg filtering for AHUB RX holes to prevent invalid addresses from being marked valid.
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