manifest: Update nRF hw models to latest

Update the HW models module to:
b84bd7314a239f818e78f6927f5673247816df53

Including the following:
b84bd73 UART PTY backend: Correct a few comments
f945d62 RADIO 54: Fix reset value of TIMING register
9fd4133 MDK nrfx_erratas.h: Ensure backwards compatibility with old
        nrfx versions
85061b1 MDK: Provide empty replacement for nrf_erratas.h

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

Author: aescolar

west.yml

@@ -318,7 +318,7 @@ manifest:
       groups:
         - tools
     - name: nrf_hw_models
-      revision: 73a5d5827a94820be65b7d276d28173ec10bab9f
+      revision: b84bd7314a239f818e78f6927f5673247816df53
       path: modules/bsim_hw_models/nrf_hw_models
     - name: nrf_wifi
       revision: 86de376136b668bf9372e8e5414aa6aad89ccd13