ASoC: hdac_hdmi: remove unused 'dai_map'

In hdac_hdmi_playback_cleanup(), a variable 'dai_map' is initialized but not
used. Also while removing this two mare variables 'edev' and 'hdmi' become
unused, so remove all these as well.

sound/soc/codecs/hdac_hdmi.c: In function ‘hdac_hdmi_playback_cleanup’:
sound/soc/codecs/hdac_hdmi.c:470:32: warning: variable ‘dai_map’ set but not used [-Wunused-but-set-variable]
  struct hdac_hdmi_dai_pin_map *dai_map;

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>