Introduces a new rv32m1_vega board configuration for the zero-riscy
core. It assumes that the soc has been reconfigured with openocd to boot
to the zero-riscy core instead of the ri5cy core.
Refactors the board-level device tree so the ri5cy and zero-riscy
configurations share common definitions for the led, button, and sensor
nodes.
Tested with:
- samples/hello_world
- samples/synchronization
- samples/basic/blinky
- samples/basic/button
- samples/sensor/fxos8700
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>