[ALSA] soc - neo1973_wm8753.c cleanup checkpatch issues

Clean up a few issues with the file that checkpatch noted, no functionality
changes.

Signed-off-by: Graeme Gregory <graeme@openmoko.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>