Audio HAL: remove unused kctls from mixer paths files

note: remove unused kctls from mixer_paths_bolero_snd.xml and sound_trigger_mixer_paths.xml to avoid error messages showed during initialization

Bug: 184149926

Test: push xml files and reboot to see if the sound card bring up successfully or not(10 times)
Change-Id: I6bd52456a6d7ecda27025a527ff6a687ec990824