Add fwu deployment configuration for SP

Extends fwu deployment with a configuration for running the
update agent within an SP. To support FVP/Qemu based testing,
secure flash is implemented using a file residing on the host
PC, accessed using semihosting.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: I216db494129d32822cb8e2011b0924fa1cc4e978
8 files changed