Merge branch 'feature/btdm_avrcp_volume' into 'master'

components/bt: Add AVRCP feature about volume

See merge request idf/esp-idf!5209

diff --cc components/bt/host/bluedroid/api/esp_avrc_api.c
Simple merge

diff --cc components/bt/host/bluedroid/api/include/api/esp_avrc_api.h
Simple merge

diff --cc components/bt/host/bluedroid/bta/av/bta_av_cfg.c
Simple merge

diff --cc components/bt/host/bluedroid/bta/av/bta_av_main.c
Simple merge

diff --cc components/bt/host/bluedroid/bta/include/bta/bta_av_api.h
Simple merge

diff --cc components/bt/host/bluedroid/btc/profile/std/avrc/btc_avrc.c
Simple merge

diff --cc components/bt/host/bluedroid/btc/profile/std/include/btc_avrc.h
Simple merge