CC3XX: Fix review comments from the TRNG refactoring

* Fix minor comments and doxygen structure
* align_memcpy_uint64_t() in a separate static function

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I862487ffe568ca7fb3ae63e3412f6cd9cc42afa9
4 files changed