This commit uses the newly introduced image_count_options() function
to:

 - See if there is any DATA option that require the creation of an
   extended header for v0 header.

 - Verify that no more than one payload has been provided when
   creating a v0 header.

 - Verify that no more than one binary payload has been provided when
   creating a v1 header. Technically speaking, it is possible to
   support several payloads, but in real life, only one gets used, so
   we will only support that to make the code simpler for now. It can
   always be extended later on if needed.

 - Verify that no more than one payload has been provided when
   creating a v1 header.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>