xtensa-build-zephyr.py: add ipc4 build support for tgl

[aiChaoSONG]

Add ipc4 build support for tgl with OVERLAY_CONFIG.

Signed-off-by: Chao Song chao.song@linux.intel.com

if any other IPC4 config should be added, please comment.

similar implementation in xtensa-build-zephyr.sh will not be done, because it is going to be deprecated, use xtensa-build-zephyr.py instead.

[aiChaoSONG]

Andrey proposed a very nice solution for sof+zephyr+ipc4 build, but it cannot implemented very soon because of the complexity, and it is still under discussion.

This PR borrows some concepts from there, for example, file structure. The solution here uses the OVERLAY_CONFIG for IPC4 software config overlay instead of CONF_FILE, and make use of Marc's patch on west signzephyrproject-rtos/zephyr#42993.

This solution targeting on a temporary solution for sof+zephyr+ipc4 build, it has no implementation conflict with the Andrey's solution. Your can take this PR here as part of Andrey's solution

[kv2019i]

Looks great, thanks @aiChaoSONG ! Slight typo in commit "zepher"->"zephyr".

[gkbldcig]

Can one of the admins verify this patch?

[lgirdwood]

@aborisovich any comments ?

[marc-hb]

Slight typo in commit "zepher"->"zephyr".

Also, don't drop the .py suffix in the subject because we still have the .sh script right now (for a limited time)

[aborisovich]

Its ok for a starting point 👍

[aiChaoSONG]

Version 2:

• fix typo zepher -> zephyr
• address reviews from Marc

Can you rename tgl_ipc4_overlay.conf to just ipc4_overlay.conf ? All the rest LGTM

[marc-hb]

We have two xtensa-build-zephyr build scripts right now, transitioning from .sh to .py. Please keep the filename extension in the commit subject otherwise it makes managing the transition period much harder than it has to be.

[marc-hb]

I'm removing the IPC3 option in #6320 because it never did anything and now ./scripts/xtensa-build-zephyr.py -i IPC3 mtl is building IPC4 for MTL (cause it's MTL's default).