VS image: load zero profiles for dynamic model only

Signed-off-by: Stephen Sun <stephens@nvidia.com>

platform/vs/docker-sonic-vs/buffermgrd.sh

@@ -5,13 +5,13 @@ export ASIC_VENDOR=vs
 
 if [ "$BUFFER_CALCULATION_MODE" == "dynamic" ]; then
     BUFFERMGRD_ARGS="-a /etc/sonic/asic_table.json"
+
+    if [ -f /etc/sonic/zero_profiles.json ]; then
+        BUFFERMGRD_ZERO_PROFILE_ARGS=" -z /etc/sonic/zero_profiles.json"
+    fi
 else
     # Should we use the fallback MAC in case it is not found in Device.Metadata
     BUFFERMGRD_ARGS="-l /usr/share/sonic/hwsku/pg_profile_lookup.ini"
 fi
 
-if [ -f /etc/sonic/zero_profiles.json ]; then
-    BUFFERMGRD_ZERO_PROFILE_ARGS=" -z /etc/sonic/zero_profiles.json"
-fi
-
 exec /usr/bin/buffermgrd ${BUFFERMGRD_ARGS} ${BUFFERMGRD_ZERO_PROFILE_ARGS}