Build: Add config to run CC3XX_RUNTIME_ENABLED on S1/B1

Add option to exercise this experimental configuration under the
"nightly_cc3xx_runtime_enabled" group

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: Ia2af7bf110e75c0fe85c62dbd44502c8624a3981
2 files changed