Modify the size of the attributes field to comply with msc limitations.

firmware/lib/cgptlib/include/gpt.h

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Defines EFI related structure. See more details in EFI 2.3 spec.
  *
  * To download EFI standard, please visit UEFI homepage:
  *    http://www.uefi.org/
  */
 #ifndef VBOOT_REFERENCE_CGPTLIB_GPT_H_
@@ skipping 78 matching lines @@
 /* GPT partition entry defines the starting and ending LBAs of a partition.
  * It also contains the unique GUID, type, and attribute bits.
  *
  * You may find more details in chapter 5 of EFI standard.
  */
 typedef struct {
   Guid type;
   Guid unique;
   uint64_t starting_lba;
   uint64_t ending_lba;
-  uint64_t attributes;
+  union {
+    struct {
+     uint64_t         : 48;
+     uint16_t gpt_att : 16;
+    } __attribute__((packed)) fields;
+    uint64_t whole;
+  } attrs;
   uint16_t name[36];                    /* UTF-16 encoded partition name */
   uint8_t reserved[];                   /* nothing, really */
 } __attribute__((packed)) GptEntry;
 
 #endif  /* VBOOT_REFERENCE_CGPTLIB_GPT_H_ */