dm: sound: Use the correct number of channels for sound
At present the 'beep' sound generates a waveform for only one channel even if two are being used. This means that the beep is twice the frequency it should be. Correct this by making it a parameter. The fix in a previous commit was correct for sandbox but not for other boards. Fixes: 03f11e87 ("sound: Correct data output in sound_create_square_wave()") Signed-off-by:Simon Glass <sjg@chromium.org>
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