10570 Need workaround to EFI boot on AMI BIOS

@@ -22,10 +22,11 @@
 /*
  * Copyright 2012 DEY Storage Systems, Inc.  All rights reserved.
  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  * Copyright 2016 Toomas Soome <tsoome@me.com>
+ * Copyright (c) 2019, Joyent, Inc.
  */
 
 /*
  * This module provides support for labeling operations for target
  * drivers.

@@ -2745,11 +2746,11 @@
 static int
 cmlb_validate_efi(efi_gpt_t *labp)
 {
         if (labp->efi_gpt_Signature != EFI_SIGNATURE)
                 return (EINVAL);
-        /* at least 96 bytes in this version of the spec. */
+        /* at least 92 bytes in this version of the spec. */
         if (sizeof (efi_gpt_t) - sizeof (labp->efi_gpt_Reserved2) >
             labp->efi_gpt_HeaderSize)
                 return (EINVAL);
         /* this should be 128 bytes */
         if (labp->efi_gpt_SizeOfPartitionEntry != sizeof (efi_gpe_t))