xtensa: Add xtensa-amd_acp_6_0_adsp_zephyr-elf

[DINESHKUMARK1]

This adds the config and overlay files to enable building the toolchain needed for the acp_6_0 board in Zephyr.

[DINESHKUMARK1]

@stephanosio, Could you please review the pull request? There are CI test failures and it seems they are expected as mentioned in
#778 (review)
. Please let me know if anything needs to be taken care from side.

[DINESHKUMARK1]

@stephanosio, Could you please review the pull request? Please let me know if anything needs to be taken care from side.

[stephanosio]

@stephanosio, Could you please review the pull request? Please let me know if anything needs to be taken care from side.

@DINESHKUMARK1 I have created and pushed the changes in this PR to the upstream topic-amd_acp_6_0 branch so that the CI workflow changes can be tested.

I have also invited you as a collaborator to this repository, and you should be able to directly push to topic-amd_acp_6_0 branch if you need to make any further changes.

Superseded by #792.

[stephanosio]

@DINESHKUMARK1 I have modified the commit in the topic branch to fix obvious errors in the CI workflow changes; but, it looks like there is more to fix than that:

Error:     ../gnulib/import/wchar.h:747:1: error: expected ',' or '...' before 'pwc'
Error:     /__w/_temp/workspace/build/.build/xtensa-amd_acp_6_0_adsp_zephyr-elf/src/gdb/gdb/../gdbsupport/gdb_vecs.h:27:20: error: 'gdb' was not declared in this scope
Error:     /__w/_temp/workspace/build/.build/xtensa-amd_acp_6_0_adsp_zephyr-elf/src/gdb/gdb/../gdbsupport/gdb_vecs.h:27:48: error: template argument 1 is invalid
Error:     /__w/_temp/workspace/build/.build/xtensa-amd_acp_6_0_adsp_zephyr-elf/src/gdb/gdb/../gdbsupport/gdb_vecs.h:27:48: error: template argument 2 is invalid
...

https://github.com/zephyrproject-rtos/sdk-ng/actions/runs/10944341634/job/30385967408#step:13:345

You can open PRs against the topic-amd_acp_6_0 branch to test out fixes.