imx: imx8dx/qxp: enable thermal

Add thermal dts node
Enable thermal in defconfig

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/imx8qxp_mek_defconfig b/configs/imx8qxp_mek_defconfig
index 39e5f5e..cf83a67 100644
--- a/configs/imx8qxp_mek_defconfig
+++ b/configs/imx8qxp_mek_defconfig
@@ -78,5 +78,7 @@
 CONFIG_SPL_DM_REGULATOR_GPIO=y
 CONFIG_DM_SERIAL=y
 CONFIG_FSL_LPUART=y
+CONFIG_DM_THERMAL=y
+CONFIG_IMX_SCU_THERMAL=y
 CONFIG_SPL_TINY_MEMSET=y
 # CONFIG_EFI_LOADER is not set