UPSTREAM: ASoC: hdmi-codec: remove unused spk_mask member

fix cppcheck warning:

sound/soc/codecs/hdmi-codec.c:25:16: style: struct member
'hdmi_codec_channel_map_table::spk_mask' is never
used. [unusedStructMember]
 unsigned long spk_mask;  /* speaker position bit mask */
               ^

Bug: 239396464
Change-Id: I235b7757db88bfbd059ad0f9795908fbfbb1cfdb
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210312182246.5153-12-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
(cherry picked from commit 9ad869fe)