thermal: qoriq: add i.mx8mq support

Add i.mx8mq specific compatible string.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

Documentation/devicetree/bindings/thermal/qoriq-thermal.txt

 * Thermal Monitoring Unit (TMU) on Freescale QorIQ SoCs
 
 Required properties:
-- compatible : Must include "fsl,qoriq-tmu". The version of the device is
-	determined by the TMU IP Block Revision Register (IPBRR0) at
-	offset 0x0BF8.
+- compatible : Must include "fsl,qoriq-tmu" or "fsl,imx8mq-tmu". The
+	version of the device is determined by the TMU IP Block Revision
+	Register (IPBRR0) at offset 0x0BF8.
 	Table of correspondences between IPBRR0 values and example  chips:
 		Value           Device
 		----------      -----

drivers/thermal/qoriq_thermal.c

@@ -305,6 +305,7 @@ static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
 
 static const struct of_device_id qoriq_tmu_match[] = {
 	{ .compatible = "fsl,qoriq-tmu", },
+	{ .compatible = "fsl,imx8mq-tmu", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, qoriq_tmu_match);