[***DO NOT MERGE***] west.yml: Bisect Zephyr test

*** DO NOT MERGE ***

Updates Zephyr to test fuzzer CI.

Signed-off-by: Serhiy Katsyuba <serhiy.katsyuba@intel.com>

Author: serhiy-katsyuba-intel

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: c99605126cd9cce5684ddd9ad56aed5292004867
+      revision: ef8bbab600cc7b1254261eb5a0dd2fdfd9e3fa9a
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision