efi_loader: move efi_(u)intn_t to efi.h

Move efi_intn_t and efi_uintn_t to include/efi.h to allow usage without
efi_api.h

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/efi.h b/include/efi.h
index 5695273..503fbf0 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -20,6 +20,11 @@
 #include <linux/string.h>
 #include <linux/types.h>
 
+/* Type INTN in UEFI specification */
+#define efi_intn_t ssize_t
+/* Type UINTN in UEFI specification*/
+#define efi_uintn_t size_t
+
 /*
  * EFI on x86_64 uses the Microsoft ABI which is not the default for GCC.
  *