contrib/rtos-helpers/FreeRTOS-openocd: change license to CC0-1.0

This file is intended to be included in any user's project that
plans to use OpenOCD awareness for FreeRTOS.
It is supposed to be distributed under a permissive license to not
impact the original license of the user's project.

Distribute it under Creative Commons Zero v1.0 Universal license.

Change-Id: I7ac90e8b742517bcafc08c00662625671c8159c4
Signed-off-by: Antonio Borneo <[email protected]>
Reviewed-on: https://review.openocd.org/c/openocd/+/7995
Reviewed-by: Karl Palsson <[email protected]>
Reviewed-by: Paul Fertser <[email protected]>
Tested-by: jenkins

The openocd-0.12.0 release

Signed-off-by: Paul Fertser <[email protected]>

The openocd-0.12.0-rc3 release candidate

Change-Id: Id7ddf232593e1aa7cb36f2b30fe832ebf79c1535
Signed-off-by: Antonio Borneo <[email protected]>

The openocd-0.12.0-rc2 release candidate

Signed-off-by: Paul Fertser <[email protected]>

The openocd-0.12.0-rc1 release candidate

Change-Id: I790a6b13962649037c97e32d562dffd58d3daf3c
Signed-off-by: Antonio Borneo <[email protected]>

The openocd-0.11.0 release.

The openocd-0.11.0-rc2 release.

The openocd-0.11.0-rc1 release.

The openocd-0.10.0 release.

The openocd-0.10.0-rc2 release candidate.