regmap: cache: Write consecutive registers in a single block write

When syncing blocks of data using raw writes combine the writes into a
single block write, saving us bus overhead for setup, addressing and
teardown.

Currently the block write is done unconditionally as it is expected that
hardware which has a register format which can support raw writes will
support auto incrementing writes, this decision may need to be revised in
future.

Signed-off-by: Mark Brown <[email protected]>
Reviewed-by: Dimitris Papastamos <[email protected]>

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