peci: Add device detection

Since PECI devices are discoverable, we can dynamically detect devices
that are actually available in the system.

This change complements the earlier implementation by rescanning PECI
bus to detect available devices. For this purpose, it also introduces the
minimal API for PECI requests.

Reviewed-by: Pierre-Louis Bossart <[email protected]>
Acked-by: Joel Stanley <[email protected]>
Signed-off-by: Iwona Winiarska <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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