manifest: pull nrf_rpc initialization fix

Fix one missed scenario in which transport_initialized flag
may be false because of the thread running nrf_rpc_init()
being switched out by the scheduler before setting this flag.

Signed-off-by: Damian Krolik <damian.krolik@nordicsemi.no>

Author: Damian-Nordic

west.yml

@@ -145,7 +145,7 @@ manifest:
     - name: nrfxlib
       repo-path: sdk-nrfxlib
       path: nrfxlib
-      revision: 781639f43dc9605b6018f3a8ccd05f588a4bad6e
+      revision: pull/1681/head
     - name: trusted-firmware-m
       repo-path: sdk-trusted-firmware-m
       path: modules/tee/tf-m/trusted-firmware-m