zephyr: Enable support for Xtensa

[dbaluta]

Make libmetal usable also for Xtensa targets.

Signed-off-by: Daniel Baluta daniel.baluta@nxp.com

[carlocaione]

Can you also add the build test for Xtensa (see #195)?

[dbaluta]

@carlocaione will do after #195 is merged so that we can avoid conflicts.

[arnopo]

@carlocaione will do after #195 is merged so that we can avoid conflicts.

Hi @dbaluta
I would prefer that you add the CI test in your pull request. No issue to merge this one before my PR #195

Thanks,
Arnaud

[dbaluta]

@arnopo all right, will do that today.

Later edit: done!

[arnopo]

LGTM

[carlocaione]

@arnopo do you think that we can tag a new release after me merge the new support for Xtensa e RISCV?

[arnopo]

@arnopo do you think that we can tag a new release after me merge the new support for Xtensa e RISCV?

I'm waiting @edmooring approval before integrating both.
Then new release is planned in April 2022. If the need is for Zephyr I propose to back port the PRs in zephyr waiting the new release.

[edmooring]

Looks good to go.