19119: makefiles/tools/serial.inc.mk: Allow detection of debug adapter r=benpicco a=maribu
### Contribution description
This PR adds the ability to automatically detect the debug adapter for boards with an integrated programmer/debugger, if that debugger also provides the TTY.
This extends the TTY detection that can be enabled with `MOST_RECENT_PORT=1` to set `DEBUG_ADAPTER_ID` to the TTY's serial, but only if `DEBUG_ADAPTER_ID_IS_TTY_SERIAL` is set to `1` by the board (as not all boards have an integrated programmer/debugger).
### Testing procedure
Connect a HiFive-1B and a nRF52840DK at the same time and try `make BOARD=<nrf52840dk|hifive1b> MOST_RECENT_PORT=1 -C examples/default flash term` for both. The programmer will not reliably select the correct programmer in `master`. With this PR, it will.
### Issues/PRs references
None
19313: gnrc_static: don't parse address as prefix r=benpicco a=benpicco
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
Co-authored-by: Benjamin Valentin <benpicco@beuth-hochschule.de>
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