efi: Add the component-name2 protocol to efidebug dh

Add the GUID and API for this protocol so that we can use it in the
'efidebug dh' command.

Signed-off-by: Simon Glass <sjg@chromium.org>

lib/efi/device_path.c

@@ -37,6 +37,7 @@ const efi_guid_t efi_guid_fdt = EFI_FDT_GUID;
 /* GUID of the EFI_DRIVER_BINDING_PROTOCOL */
 const efi_guid_t efi_guid_driver_binding_protocol =
 			EFI_DRIVER_BINDING_PROTOCOL_GUID;
+const efi_guid_t efi_guid_component_name2 = EFI_COMPONENT_NAME2_PROTOCOL_GUID;
 
 /* template EFI_DP_END node: */
 const struct efi_device_path EFI_DP_END = {