ASoC: sn95031 fix the code style and format inconsistencies

this patch fixes inconsistencies commented by Mark.
This also fixes few other style things in audio_map & header file

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Harsha Priya <priya.harsha@intel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>