Merge branch 'bugfix/btdm_add_readme_for_BLE_demos' into 'master'

Component/bt: add readme doc for BLE demos

See merge request idf/esp-idf!4890

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

diff --cc components/bt/bluedroid/hci/hci_hal_h4.c
Simple merge

diff --cc components/bt/bluedroid/stack/btm/btm_ble_gap.c
Simple merge

diff --cc components/bt/bluedroid/stack/l2cap/l2c_ble.c
Simple merge

diff --cc components/bt/include/esp_bt.h
Simple merge