mkeficapsule: fix efi_firmware_management_capsule_header data type

The data type of item_offset_list shall be UINT64 according to the UEFI [1]
specifications.

In include/efi_api.h the correct data type is used. The bug was probably
never noticed because of little endianness.

[1] https://uefi.org/specs/UEFI/2.10/index.html

Signed-off-by: Malte Schmidt <malte.schmidt@weidmueller.com>

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
diff --git a/tools/eficapsule.h b/tools/eficapsule.h
index 072a4b5..6ffed6c 100644
--- a/tools/eficapsule.h
+++ b/tools/eficapsule.h
@@ -63,7 +63,7 @@
 	uint32_t version;
 	uint16_t embedded_driver_count;
 	uint16_t payload_item_count;
-	uint32_t item_offset_list[];
+	uint64_t item_offset_list[];
 } __packed;
 
 /* image_capsule_support */