cmsis: cmsis_6: Update CMSIS to cmsis_6

[RobinKastberg]

Currently we are using CMSIS 5.9.0.
This is deprecated by ARM and replaced by CMSIS 6.
This will be required for support the IAR toolchain, TrustedFirmware-M,
and to receive further upstream updates.

Currently I have a PR going against zephyrproject-rtos/CMSIS_6 do finalize the integration.

I removed CMSIS 5 since I couldn't come up with a good reason to keep it. But maybe someone else can.

[zephyrbot]

The following west manifest projects have changed revision in this Pull Request:

Name	Old Revision	New Revision	Diff
cmsis	4b96cbb174678dcd3ca86e11e1f24bc5f8726da0	zephyrproject-rtos/CMSIS_6#1	zephyrproject-rtos/CMSIS_6#1/files
cmsis_6 ❌	zephyrproject-rtos/CMSIS_6@783317a (main)	N/A (Removed)	N/A

Additional metadata changed:

Name	URL	Submodules	West cmds	module.yml
cmsis	✏			✏

⛔ DNM label due to: 1 removed project, 1 project with PR revision and 1 project with metadata changes

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[RobinKastberg]

It looks like Cortex-R support is NOT in ARM/CMSIS_6 (and not in ARM/CMSIS_5 either), rather coming from here
zephyrproject-rtos/cmsis@54eaf19

[github-actions]

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