arm: Remove stray references to dev/sound/chip.h
Fixes: 923e0040a59a ("sound: Move chip.h contents to pcm/sound.h")
Reported by: Jenkins CI
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
(cherry picked from commit a3513995f549e2e649b89a1fecbfb351d9825bac)