I've updated a laptop Acer C720 to r368166 (which contains the fix reviewed here). It seems there is no way to get devinfo->init_clear to set to 1. I added a few debug statements in hdaa.c and here is what gets logged to messages:
Dec 16 08:21:33 c720-r368166 kernel: hdaa0: DEBUG hdaa.c: hdaa_audio_prepare_pin_ctrl() has devinfo->init_clear as: 0 Dec 16 08:21:33 c720-r368166 kernel: hdaa0: DEBUG hdaa.c: hdaa_attach() calls SYSCTL_ADD_INT() macro for init_clear Dec 16 08:21:33 c720-r368166 kernel: hdaa1: DEBUG hdaa.c: hdaa_audio_prepare_pin_ctrl() has devinfo->init_clear as: 0 Dec 16 08:21:33 c720-r368166 kernel: hdaa1: DEBUG hdaa.c: hdaa_attach() calls SYSCTL_ADD_INT() macro for init_clear
See also PR 251727