VW MQB: AEB actuation setup

[jyoung8607]

Need this anyway to support OP long with a camera harness, which requires silencing the radar with UDS. We get away without sending these today because we pass through stock FCW/AEB messaging using a gateway harness.

• [x] ~~Calculate E2E Profile 2 data identifiers (CRC magic bytes) for ACC_10~~ (turns it it's already there)
• [ ] commaai/panda#2014
• [x] Start sending, with reasonable defaults
• [ ] Verify in-car the aeb_supported toggle and default state complies with openpilot standard practice
• [ ] harmonize API and tests with whatever @adeebshihadeh drops for Toyota