phycore-imx8mm_defconfig: Enable CONFIG_IMX_TMU

Enable the imx thermal driver to prevent booting when the system is too
hot.

Signed-off-by: Benjamin Hahn <B.Hahn@phytec.de>
diff --git a/configs/phycore-imx8mm_defconfig b/configs/phycore-imx8mm_defconfig
index bcc38d5..3a81ea7 100644
--- a/configs/phycore-imx8mm_defconfig
+++ b/configs/phycore-imx8mm_defconfig
@@ -128,4 +128,5 @@
 CONFIG_SYSRESET_PSCI=y
 CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_DM_THERMAL=y
+CONFIG_IMX_TMU=y
 CONFIG_IMX_WATCHDOG=y