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Add mixer support for the Focusrite Scarlett 4i4, 8i6, 18i8, and 18i20
Gen 3 devices.
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/22d0dc877dec026eb19630edec217ab72ebcd50a.1624379707.git.g@b4.vu

Signed-off-by: Takashi Iwai <tiwai@suse.de>