fw: Switch to board native_sim/native/64

Using this board by default allows easier development since it compiles
to a Linux executable which can be executed with `./zephyr.exe`,
debugged with `gdb zephyr.exe` and has a virtual serial port for the
Zephyr shell.

Later the 32 bit version or even a QEMU variant should be used but the
64 bit variant is a low hanging fruit since the host libraries can be
used. This is not wanted but easy to accomplish.

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