thermal: Add COMPILE_TEST support for i.MX8MM

Add COMPILE_TEST support to i.MX8MM thermal driver for better compile
testing coverage.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1583509057-8197-1-git-send-email-Anson.Huang@nxp.com

drivers/thermal/Kconfig

@@ -265,7 +265,7 @@ config IMX_SC_THERMAL
 
 config IMX8MM_THERMAL
 	tristate "Temperature sensor driver for Freescale i.MX8MM SoC"
-	depends on ARCH_MXC
+	depends on ARCH_MXC || COMPILE_TEST
 	depends on OF
 	help
 	  Support for Thermal Monitoring Unit (TMU) found on Freescale i.MX8MM SoC.