bootindex: rework add_boot_device_path function

Add the function of updating bootindex about fw_boot_order list
in add_boot_device_path(). We should delete the old one if a
device has existed in global fw_boot_order list.
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Reviewed-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

bootdevice.c

@@ -82,6 +82,8 @@ void add_boot_device_path(int32_t bootindex, DeviceState *dev,
 
     assert(dev != NULL || suffix != NULL);
 
+    del_boot_device_path(dev, suffix);
+
     node = g_malloc0(sizeof(FWBootEntry));
     node->bootindex = bootindex;
     node->suffix = g_strdup(suffix);