tee: replace getnstimeofday64() with ktime_get_real_ts64()

The two do the same thing, but we want to have a consistent
naming in the kernel.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

drivers/tee/optee/rpc.c

@@ -48,7 +48,7 @@ static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
 			OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
 		goto bad;
 
-	getnstimeofday64(&ts);
+	ktime_get_real_ts64(&ts);
 	arg->params[0].u.value.a = ts.tv_sec;
 	arg->params[0].u.value.b = ts.tv_nsec;