Adds a command that can be used to modify the GPT partition table to
indicate which partitions should have the bootable flag set
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Adds an additional variable called gpt_partition_bootable that indicates
if the given partition is bootable or not.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>