xtensa: add xtensa-intel_ace30_ptl_zephyr-elf

[dcpleung]

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This adds the config and overlay files to enable building the toolchain needed for the intel_adsp/ace30_ptl board in Zephyr.

Needs these to fully build for the board:

• https://github.com/zephyrproject-rtos/hal_xtensa/pull/29
• https://github.com/thesofproject/sof/pull/9185