manifest: Update nrfxlib

Updates the nrf_rpc library to allow initialization
of single nrf_rpc groups.

Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>

west.yml

@@ -146,7 +146,7 @@ manifest:
     - name: nrfxlib
       repo-path: sdk-nrfxlib
       path: nrfxlib
-      revision: bcab5c5f72c8953be2a45c4529e4a70e70ffa6ae
+      revision: pull/1593/head
     - name: trusted-firmware-m
       repo-path: sdk-trusted-firmware-m
       path: modules/tee/tf-m/trusted-firmware-m