[Mellanox][Smartswitch]Changes for mounting dbus socket (#20816)

Why I did it
This PR is a temporary change, once the rshim interface will be replaced this PR will not be required anymore

To mount the dbus socket in pmon container as systemctl command has to be executed to start/stop service from PMON container during admin state/ reboot command execution

dockers/docker-platform-monitor/Dockerfile.j2 - Addition of dbus package for mellanox specific platform in order to use dbus-send command
files/build_templates/docker_image_ctl.j2 - Mount socket, since we need to use the systemctl command to start/stop service from pmon container

How I did it
How to verify it
dbus-send commands in Pmon container can be performed in order to start / stop the [email protected] which is relevant for starting or stopping the rshim service

Author: gpunathilell

dockers/docker-platform-monitor/Dockerfile.j2

@@ -29,6 +29,9 @@ RUN apt-get update &&   \
         nvme-cli        \
         ethtool         \
         xxd
+{% if sonic_asic_platform == 'mellanox' %}
+RUN apt-get install -y dbus
+{% endif %}
 
 # smartmontools version should match the installed smartmontools in sonic_debian_extension build template
 RUN apt-get install -y -t bookworm-backports \

files/build_templates/docker_image_ctl.j2

@@ -621,6 +621,13 @@ start() {
 
 {%- if sonic_asic_platform == "mellanox" %}
     # TODO: Mellanox will remove the --tmpfs exception after SDK socket path changed in new SDK version
+{%- if docker_container_name == "pmon" %}
+    if [[ $NUM_DPU -gt 0 ]]; then
+        SMARTSWITCH_MNT= " -v /var/run/dbus/system_bus_socket:/var/run/dbus/system_bus_socket"
+    else
+        SMARTSWITCH_MNT= ""
+    fi
+{%- endif %}
 {%- endif %}
     docker create {{docker_image_run_opt}} \
 {%- if docker_container_name != "dhcp_server" %}
@@ -648,6 +655,7 @@ start() {
         -v /var/run/hw-management:/var/run/hw-management:rw \
         -v mlnx_sdk_socket:/var/run/sx_sdk \
         -v /tmp/nv-syncd-shared/:/tmp \
+        $SMARTSWITCH_MNT \
         -v /dev/shm:/dev/shm:rw \
         -e SX_API_SOCKET_FILE=/var/run/sx_sdk/sx_api.sock \
         -v /dev/shm:/dev/shm:rw \