manifest: Update nrfxlib to align to GPPI in nrfx 4.0

Update manifest for nrfxlib.

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

west.yml

@@ -146,7 +146,7 @@ manifest:
     - name: nrfxlib
       repo-path: sdk-nrfxlib
       path: nrfxlib
-      revision: ff5b4a1dda75ef8689bffc2df47fbd9186e1fc82
+      revision: pull/1899/head
     - name: trusted-firmware-m
       repo-path: sdk-trusted-firmware-m
       path: modules/tee/tf-m/trusted-firmware-m