REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1834
1)Add arguments "--embedded-driver" to support embedded driver
in command line.
2)Add arguments "--update-image-index" to identify ImageIndex
within the device in command line.
3)Add arguments "-j JSONFILE" to support multiple payloads and
embedded drivers with JSON file.
The update is in a backwards compatible manner, so all command
line options to support single payload are still supported. But
all the options associated with multiple payloads should be
provided in a JSON file.
Cc: Bob Feng <bob.c.feng@intel.com>
Signed-off-by: Eric Jin <eric.jin@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>