Add hw TRNG from SEL0 SP

Intgrates the FVP TRNG into the crypto sp to provide a hw
entropy source.  Includes tests that check SP device
region configuration loading and MMIO access within the
region.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: Ia9af8b044596e1c7d194f039fdf64c2468bb3221
41 files changed