[efi] Centralise EFI file system info GUIDs

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/efi/efi.h

 extern EFI_GUID efi_usb_io_protocol_guid;
 extern EFI_GUID efi_vlan_config_protocol_guid;
 
+extern EFI_GUID efi_file_info_id;
+extern EFI_GUID efi_file_system_info_id;
+
 extern EFI_HANDLE efi_image_handle;
 extern EFI_LOADED_IMAGE_PROTOCOL *efi_loaded_image;
 extern EFI_DEVICE_PATH_PROTOCOL *efi_loaded_image_path;

src/interface/efi/efi_file.c

 #include <ipxe/efi/efi_strings.h>
 #include <ipxe/efi/efi_file.h>
 
-/** EFI file information GUID */
-static EFI_GUID efi_file_info_id = EFI_FILE_INFO_ID;
-
-/** EFI file system information GUID */
-static EFI_GUID efi_file_system_info_id = EFI_FILE_SYSTEM_INFO_ID;
-
 /** EFI media ID */
 #define EFI_MEDIA_ID_MAGIC 0x69505845
 

src/interface/efi/efi_guid.c

 #include <ipxe/efi/Protocol/Usb2HostController.h>
 #include <ipxe/efi/Protocol/UsbIo.h>
 #include <ipxe/efi/Protocol/VlanConfig.h>
+#include <ipxe/efi/Guid/FileInfo.h>
+#include <ipxe/efi/Guid/FileSystemInfo.h>
 
 /** @file
  *
 /** VLAN configuration protocol GUID */
 EFI_GUID efi_vlan_config_protocol_guid
 	= EFI_VLAN_CONFIG_PROTOCOL_GUID;
+
+/** File information GUID */
+EFI_GUID efi_file_info_id = EFI_FILE_INFO_ID;
+
+/** File system information GUID */
+EFI_GUID efi_file_system_info_id = EFI_FILE_SYSTEM_INFO_ID;