eficonfig: scan media device in eficonfig startup

In eficonfig startup, scan media devices and update
the UEFI boot option.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
diff --git a/cmd/eficonfig.c b/cmd/eficonfig.c
index bbd6c32..99c83d1 100644
--- a/cmd/eficonfig.c
+++ b/cmd/eficonfig.c
@@ -2129,6 +2129,10 @@
 	if (ret != EFI_SUCCESS)
 		return CMD_RET_FAILURE;
 
+	ret = eficonfig_generate_media_device_boot_option();
+	if (ret != EFI_SUCCESS && ret != EFI_NOT_FOUND)
+		return ret;
+
 	while (1) {
 		efi_menu = eficonfig_create_fixed_menu(maintenance_menu_items,
 						       ARRAY_SIZE(maintenance_menu_items));