modules: sof: use k_smp_cpu_custom_start for core power up

This updates the SOF to use the newly introduced
k_smp_cpu_custom_start() for secondary core power up.
This removes the need to mirror part of the SMP power up
code from Zephyr kernel into SOF tree. Also removes the need
to expose private kernel code to SOF.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

submanifests/optional.yaml

@@ -34,7 +34,7 @@ manifest:
       groups:
         - optional
     - name: sof
-      revision: e7cb489d430dc2181e4a5f7f953ed1eaeec6668d
+      revision: 37dd5e62663fcedca659c2104043529b3855a1b0
       path: modules/audio/sof
       remote: upstream
       groups: