manifest: update collab-nrfx-4.0 to have selectable SPIM/SPIS

Manifest update.

Signed-off-by: Michał Stasiak <[email protected]>

Author: mstasiaknordic

west.yml

@@ -66,7 +66,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: a0491b6ceaf072ff7fa108ecfeddb7cbc6c3afa7
+      revision: pull/3420/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above