EspSoftwareSerial 6.11.2: Delegate<> assign operators added. (#7815)
EspSoftwareSerial 6.11.2: Delegate<> assign operators added. (#7815)

Addresses compilation errors with pending PRs due to commit 95fb104562
esp8266/Arduino,esp8266/Arduino,esp8266/Arduino,sticilface/Arduino,sticilface/Arduino,esp8266/Arduino,sticilface/Arduino,sticilface/Arduino,sticilface/Arduino,esp8266/Arduino