west.yml: switch to cmsis_6

Cortex-M now requries using the cmsis_6 module.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

Author: fabiobaltieri

west.yml

@@ -18,5 +18,6 @@ manifest:
         # strictly needed by the application.
         name-allowlist:
           - cmsis      # required by the ARM port
+          # x
           - hal_nordic # required by the custom_plank board (Nordic based)
           - hal_stm32  # required by the nucleo_f302r8 board (STM32 based)