Non secure OTA compliant with arduino Create

[pennam]

Only secure OTA is available. If security keys are not configured non secure OTA should be made available.

Steps needed:

• Restore non signed and non encrypted OTA feature
• Rebuild provisioning sketch
• Fix Arduino_Portenta_OTA in order to check also bootloader type and not only version number

[pennam]

• Restore non signed and non encrypted OTA feature

Done in #4

[pennam]

• Rebuild provisioning sketch

Done https://github.com/bcmi-labs/iot-api/pull/801

[pennam]

• Fix Arduino_Portenta_OTA in order to check also bootloader type and not only version number

Not needed since we have released this bootloader with version 25