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This patch refactors the code to query the external sample rate and its
translation into the corresponding enum into a helper function to
prevent future code duplication.

A later commit will make use of this new helper function.
Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>