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Sometimes it is useful to be able to extract an index of certain string value from an array of strings. A typical use case is to give a name to a DMA channel, PWM, clock and so on. Provide an implementation using unified device property accessors that follows of_property_match_string() but works for all supported fwnodes. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>