boards: Migrate to zephyr,mapped-partition about rp2xxx boards

- remove `compatible = "fixed-partitions";`
- add `compatible = "zephyr,mapped-partition";` for each partition entries
- Add `ranges` for flash0 on Adafruit Metro RP2350 and WeAct RP2350B

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
33 files changed