Enable TLS in Tasmota-zbbridge

[s-hadinger]

Description:

In Tasmota-zbbridge, enable optional TLS for MQTT, supporting both Letsencrypt and AWS IoT with password based authentication (no need anymore for private certificates). Also switched to 160MHz to make TLS handshake faster.

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on Tasmota core ESP8266 V.2.7.4.5
• The code change is tested and works on core ESP32 V.1.12.2
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass