staging: most: rename function

This patch renames the function audio_set_pcm_format(). Since the
function doesn't only set the PCM format anymore and to guard against
misunderstandings, its name needs to be changed.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>