GitLab

 - Reorder some models and refine comments.
 - Add SST25VF512A:
   AAI is available but with an uncommon opcode (0xAF). Fully tested
   with Bus Pirate 3.5 running 6.2 beta firmware by Cory.
 - Add SST25VF020 and SST25VF020B.

Corresponding to flashrom svn r1758.
Signed-off-by: Cory Henderson <dcoryh192@gmail.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>