feat(rng_trap): add tests for FEAT_RNG_TRAP

Added 2 tests that expect a trap to be triggered when a read is
performed on:
1. RNDR register
2. RNDRRS register
The result will be a panic signal and the whole system will halt,
as there is no handler set for such trap.

Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: Ia979e60a106b394cc09dfdf94115354fb72142d1