In practice, PPR is intended to be running code from RAM, so make this
the default choice for the `nrf54h20dk/nrf54h20/cpuppr` board target.
Keep the MRAM execution option as a `xip` variant of that target,
replacing the `ram` one.
Align the default `cpuapp` configuration for copying PPR's image to RAM
before it boots the child processor.
Signed-off-by: Grzegorz Swiderski <grzegorz.swiderski@nordicsemi.no>
Add targets for the Application, Radio, and PPR cores in the nRF54H20
SoC on the nRF54H20 DK board.
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
