Demote, cleanup and extend observed logging

system/audio_a2dp_hw/audio_a2dp_hw.c

system/bta/av/bta_av_act.c

system/bta/dm/bta_dm_act.c

system/bta/gatt/bta_gattc_act.c

system/bta/gatt/bta_gattc_api.c

system/bta/gatt/bta_gattc_cache.c

system/bta/gatt/bta_gattc_utils.c

system/bta/hh/bta_hh_api.c

system/bta/hh/bta_hh_le.c

system/bta/sys/bta_sys_main.c

system/btcore/src/counter.c

system/btcore/src/module.c

system/btif/co/bta_ag_co.c

system/btif/src/bluetooth.c

system/btif/src/btif_av.c

system/btif/src/btif_core.c

system/btif/src/btif_dm.c

system/btif/src/btif_gatt.c

system/btif/src/btif_gatt_client.c

system/btif/src/btif_gatt_multi_adv_util.c