Fix config repeat define in include deconfig mode

Signed-off-by: yezhonghui <yezhonghui@xiaomi.com>

tools/process_config.sh

@@ -56,6 +56,8 @@ process_file() {
                 exit 1
             fi
         else
+            local key_config="$(echo "$line" | cut -d= -f1)="
+            sed -i "/$key_config/d" $output_file
             echo "$line" >> $output_file
         fi
     done < "$input_file"