CC3XX: Add a stateless API to read the TRNG

This stateless API can be used also in places where global
variables are not setup yet, i.e. in pre-main. The function
does not retain any state or config that might have changed
during its execution. It does not bypass HW tests.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: Ic7d4043c77b3dac6f21da87fc252d1210b0faaa7
2 files changed