west.yml: Fix CMSIS module to use v6 for Cortex-M

Zephyr has migrated to CMSIS v6. While the plan was to transition all
ARM architectures, issues with Cortex-A and Cortex-R prevented full
adoption. As a result, only Cortex-M was updated to v6 in
zephyrproject-rtos/zephyr#89370.

Since the SC-OBC module A1 uses a Cortex-M3, we need to adopt CMSIS
v6.

That PR was merged after Zephyr v4.1.0, so older versions may still
require the legacy CMSIS module. To maintain compatibility, we are
keeping the old module alongside v6.

Signed-off-by: Yasushi SHOJI <[email protected]>

Author: yashi

west.yml

@@ -9,6 +9,7 @@ manifest:
       import:
         name-allowlist:
           - cmsis
+          - cmsis_6
 
     - name: libcsp
       url: https://github.com/libcsp/libcsp