Merge branch 'mesh/bugfix_fix_layer2_node_connection_issue_v4.3' into 'release/v4.3'

mesh: fix the issue that layer2 node connect to lower-layer node when FIXED-ROOT root disappeared(backport_v4.3)

See merge request espressif/esp-idf!15660
This commit is contained in:
Jiang Jiang Jian
2021-11-23 12:40:52 +00:00