Merge branch 'bugfix/btdm_fix_crash_adv_scan_coex_v3.1' into 'release/v3.1'

fix crash when adv and scan coex and optimize duplicate scan

See merge request idf/esp-idf!4147
This commit is contained in:
Jiang Jiang Jian
2019-01-25 12:04:55 +08:00