manifest: Update zephyr, mcuboot, and nrfxlib

Update Zephyr, mcuboot, and nrfxlib repositories to fix compilation
warnings discovered by clang.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

west.yml

@@ -144,7 +144,7 @@ manifest:
     - name: nrfxlib
       repo-path: sdk-nrfxlib
       path: nrfxlib
-      revision: 5df35f66f3c0a63a0b451499ee4466327b707a74
+      revision: 864943e7301aa90eb684829f10905e910e844f18
     - name: trusted-firmware-m
       repo-path: sdk-trusted-firmware-m
       path: modules/tee/tf-m/trusted-firmware-m