manifest: tfm: Update nrf_mramc service for nrf7120

Update tfm MRAMC service for ns application to initialise mramc driver
change MRAMC write mode.

Signed-off-by: Travis Lam <travis.lam@nordicsemi.no>

Author: travis3630

west.yml

@@ -149,7 +149,7 @@ manifest:
     - name: trusted-firmware-m
       repo-path: sdk-trusted-firmware-m
       path: modules/tee/tf-m/trusted-firmware-m
-      revision: 7c7180bd5ac51bea384adfb6bd98979f948b692c
+      revision: pull/249/head
     - name: psa-arch-tests
       repo-path: sdk-psa-arch-tests
       path: modules/tee/tf-m/psa-arch-tests