[smart-switch][dpu] Do not run dhclient on the eth0 interface. (#21062)

[smart-switch][dpu] Do not run dhclient on the eth0 interface.

Author: oleksandrivantsiv

files/image_config/interfaces/interfaces.j2

@@ -131,6 +131,7 @@ iface {{ name }} {{ 'inet' if prefix | ipv4 else 'inet6' }} static
 {# TODO: COPP policy type rules #}
 {% endfor %}
 {% else %}
+{% if not (DEVICE_METADATA['localhost']['subtype'] == 'SmartSwitch' and DEVICE_METADATA['localhost']['switch_type'] == 'dpu') %}
 auto eth0
 iface eth0 inet dhcp
     metric 202
@@ -142,6 +143,7 @@ iface eth0 inet6 dhcp
     down sysctl net.ipv6.conf.eth0.accept_ra=0
 {% endif %}
 {% endif %}
+{% endif %}
 #
 source /etc/network/interfaces.d/*
 #