SST: Add capability to use RAM instead of flash

The execution of SST regression tests reduces the life of the flash
memory as they write/erase multiple times in the memory.
This patch adds the capability to use RAM instead of flash memory
to run SST regression tests.

Change-Id: Ie6eff8e8deebe9f8d58dd13abc5e4a4148cd6994
Signed-off-by: Marc Moreno <marc.morenoberengue@arm.com>
9 files changed