Libmetal release V2023.04.0 - v1.4.0

This release:

• update license file to cover CI test. Notice that the library is till using BSD -3-Clause license
• fixes various bugs.

API Updates:

• remove FreeRTOS deprecated METAL_MUTEX_INIT API.

What's Changed

• zephyr: cache: Use new cache API by @carlocaione in #223
• Update LICENSE.md to cover CI test scripts by @kernelchuk in #224
• examples: use atomic_flag type, __sync functions by @kernelchuk in #221
• cmake: use set_property for PROJECT_EC_FLAGS by @kernelchuk in #228
• readme: Fix broken openamp-rp mailing list link by @hiagofranco in #229
• NuttX: Add missing include header in IRQ implementation by @gustavonihei in #230
• lib: system: freertos: remove deprecated METAL_MUTEX_INIT by @arnopo in #233
• checkpatch: fix TYPO_SPELLING check for words with apostrophe by @arnopo in #232
• CI: fix zephyr cmake error "No prj.conf file was found" by @arnopo in #234
• release: open-amp 2023.04.0 by @arnopo in #235

New Contributors

• @hiagofranco made their first contribution in #229
• @gustavonihei made their first contribution in #230

Full Changelog: v2022.10.0...V2023.04.0