manifest: Bring sdk-nrf with KMU fixes

Brings sdk-nrf with the integration which allows the KMU
reserved area to be set by dts.

Signed-off-by: Georgios Vasilakis <[email protected]>

Author: Vge0rge

west.yml

@@ -14,7 +14,7 @@ manifest:
   projects:
     - name: nrf
       repo-path: sdk-nrf
-      revision: e9101127fc24a4bd5bf1b3067c78093182038d02
+      revision: pull/23870/head
       import:
         name-allowlist:
           - cmsis_6