Use same mapping as in all other machine drivers:

BTN_0 : KEY_PLAYPAUSE
BTN_1 : KEY_VOICECOMMAND
BTN_2 : KEY_VOLUMEUP
BTN_3 : KEY_VOLUMEDOWN
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20200515210731.10942-4-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>