efi_loader: add file/filesys support

fallback.efi (and probably other things) use UEFI's simple-file-system
protocol and file support to search for OS's to boot.

Signed-off-by: Rob Clark <robdclark@gmail.com>
[agraf: whitespace fixes, unsigned fixes]
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/efi.h b/include/efi.h
index 63cbdb6..a432c89 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -81,6 +81,8 @@
 #define EFI_IP_ADDRESS_CONFLICT		(EFI_ERROR_MASK | 34)
 #define EFI_HTTP_ERROR			(EFI_ERROR_MASK | 35)
 
+#define EFI_WARN_DELETE_FAILURE	2
+
 typedef unsigned long efi_status_t;
 typedef u64 efi_physical_addr_t;
 typedef u64 efi_virtual_addr_t;