Update enum values for MAV_ODID_ARM_STATUS to match the main MAVLink repository

The enum values for [MAV_ODID_ARM_STATUS](https://mavlink.io/en/messages/common.html#MAV_ODID_ARM_STATUS) were updated in the [main MAVLink repository](https://github.com/mavlink/mavlink/pull/1883) to follow the convention that the value names are prefixed with the full name of the enum.

The ArduPilot variant of MAVLink must be updated with this change and the transmitter module code updated to match.

Start by comparing the ArduPilot MAVLink definition of MAV_ODID_ARM_STATUS with the linked main MAVLink repository change. Then locate the transmitter module code that uses this enum and update it to match the renamed values. Done means the enum and transmitter references follow the main repository convention.

Written by the indexing model from the issue text.