[nrf fromtree] manifest: Update nRF hw models to latest

Update the HW models module to:
85944c64f224406e4d781aa382c5f1f71ed307fd

Including the following:
* 5340: Allocate a buffer for the APP core RAM (2nd version)
* 82ca90c Add NCS test-spec.yml to trigger downstream CI job
* a05d7a6 docs: top README: Mention nrf54l15 support and minor fixes
* cd64524 54 ECB/CCM tests: Remove comment which does not apply

Signed-off-by: Alberto Escolar Piedras <[email protected]>
(cherry picked from commit 942fa67)

Author: aescolar

west.yml

@@ -300,7 +300,7 @@ manifest:
       groups:
         - tools
     - name: nrf_hw_models
-      revision: d2a119a9c7600ce06033a794de042e0ad9a38702
+      revision: 85944c64f224406e4d781aa382c5f1f71ed307fd
       path: modules/bsim_hw_models/nrf_hw_models
     - name: open-amp
       revision: b735edbc739ad59156eb55bb8ce2583d74537719