drivers: imx: rngb: early initialization

The RNGB module must be ready during init_tee_runtime to provide a
random stack canary value during bootup.

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

Author: ldts

core/drivers/imx_rngb.c

@@ -217,4 +217,4 @@ static TEE_Result rngb_init(void)
 	return TEE_SUCCESS;
 }
 
-driver_init(rngb_init);
+early_init(rngb_init);