configs: Enable VAB flow for Agilex5 SoCFPGA boards

Vendor Authorized Boot flow configurations are enabled for boards
based on Agilex5 SoCFPGA. Also, required changes are made to the
SoCFPGA make file for building and linking relevant secure source
code files.

Signed-off-by: Naresh Kumar Ravulapalli <nareshkumar.ravulapalli@altera.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@altera.com>
3 files changed