Includes a number of updates to the Zephyr example, including removing a fair
amount of stale configuration. This is part of moving towards supporting WAMR
as a Zephyr module as described in #2782. Some functionality is removed as
part of this diff (e.g. AOT XTENSA support), but it had become stale while not
being actively maintained. It is anticipated that it (and AOT support for other
platforms) will be added back, along with CI support for ensuring they do not
become stale again.
Signed-off-by: Daniel Mangum <georgedanielmangum@gmail.com>
Zephyr can apply board specific .conf and .overlay automatically,
move .conf to boards to make it easy to support different board without
addition command parameters.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
