update to a Zephyr GDB PR

This depends on Zephyr PRs 89810 and 89620, as well as on the Linux
PR 54411. Temporarily update to the Zephyr PR.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: 4aa1ac9f969a89e79387b8a3dcb1c7ed44397cd3
+      revision: pull/89810/head
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision