feat(ff-a): add v1.2 fields to RXTX header

Add the new fields introduced in v1.2 to the partition message header.
This will fix the tests that were failing due to the `offset` being too small.

Change-Id: I58ddd8f6897d0e46b7c7f754fde7ecddd012a0ca
Signed-off-by: Karl Meakin <karl.meakin@arm.com>
1 file changed