thermal: add i.MX8 thermal driver

Add i.MX8 thermal driver to support get temperature from SCU.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index cc75e38..ef2929d 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -5,4 +5,5 @@
 
 obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o
 obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
+obj-$(CONFIG_IMX_SCU_THERMAL) += imx_scu_thermal.o
 obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o