accel/habanalabs/gaudi2: add signed dev info uAPI

User will provide a nonce via the INFO ioctl, and will retrieve
the signed device info generated using given nonce.

Signed-off-by: Moti Haimovski <mhaimovski@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>