Add no_block_io_protocol and legacy_bios_bootable attribute definitions.
These are sourced from UEFI Spec 2.3, page 105, table 19. Credits to the
libparted source for the specification pointer.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
 
 typedef struct _gpt_entry_attributes {
        unsigned long long required_to_function:1;
-       unsigned long long reserved:47;
+       unsigned long long no_block_io_protocol:1;
+       unsigned long long legacy_bios_bootable:1;
+       unsigned long long reserved:45;
        unsigned long long type_guid_specific:16;
 } __attribute__ ((packed)) gpt_entry_attributes;