make: Add groups for building tabs

[bradjc]

This adds new targets make tab-<group> EXAMPLE=x to the build system.

The groups are:

• apollo3
• clue
• esp32
• hail
• hifive
• msp432
• nrf52
• ot
• rpi
• stm

Each group would build a tab file with several TBFs targeting addresses likely to be valid on boards in that group.

Questions

1. Are these groups the right groups?
2. Where did imix go? I think it went with the nrf52. Is it better to duplicate? I'm not sure what happens to make tab then.

Todo

• [ ] Update readme.

[brghena]

Wouldn't Imix match Hail?

[bradjc]

Wouldn't Imix match Hail?

It should, we should change hail to use 0x40000 for apps. But then it too is part of nrf52...