tee: optee: fix a print error on rng probing

If we fail to probe the optee-rng device, we print a wrong message
referring to the firmware tpm.

Fixes: 476a3d58df ("tee: optee: don't fail probe because of optee-rng")
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

drivers/tee/optee/core.c

@@ -850,7 +850,7 @@ static int optee_probe(struct udevice *dev)
 		ret = device_bind_driver_to_node(dev, "optee-rng", "optee-rng",
 						 dev_ofnode(dev), NULL);
 		if (ret)
-			dev_warn(dev, "ftpm_tee failed to bind: %d\n", ret);
+			dev_warn(dev, "optee-rng failed to bind: %d\n", ret);
 	}
 
 	return 0;