west.yml: Update zephyr to point to PR

test

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Author: ranj063

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: 8c6b2c8c88773810d64a47ed3b6206b7d6e8290f
+      revision: pull/90821/head
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision