Eclipse ThreadX RTOS 6.4.1

What's Changed

• msft azure label rtos update by @ericwol-msft in #343
• Security.md update by @ericwol-msft in #347
• Update copyright. by @bo-ms in #349
• Update version id string. by @bo-ms in #350
• Update README.md text by @timlt in #351
• Create SECURITY.md by @wickste in #352
• Update CONTRIBUTING.md by @wickste in #354
• Update CONTRIBUTING.md by @wickste in #353
• update license.txt and delete licensed-hardware.txt by @wickste in #355
• Update README.md by @wickste in #362
• Update the copyright for all assembly files. by @bo-ms in #364
• Update version number to 6.4.1 by @TiejunMS in #365
• Add revision history file. by @bo-ms in #366

New Contributors

• @ericwol-msft made their first contribution in #343
• @bo-ms made their first contribution in #349
• @timlt made their first contribution in #351

Full Changelog: v6.4.0_rel...v6.4.1_rel