staging: greybus: audio: code indentation and formatting changes

Correct code indentation and realignment as per the coding style
guidelines. Issue reported by checkpatch script.

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
Link: https://lore.kernel.org/r/20201022063230.GA351623@ubuntu204


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>