configs: migrate CONFIG_IMX_THERMAL to defconfigs

Done via moveconfig.py

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/riotboard_spl_defconfig b/configs/riotboard_spl_defconfig
index 42d7377..95549ff 100644
--- a/configs/riotboard_spl_defconfig
+++ b/configs/riotboard_spl_defconfig
@@ -49,6 +49,7 @@
 CONFIG_SPI=y
 CONFIG_MXC_SPI=y
 CONFIG_DM_THERMAL=y
+CONFIG_IMX_THERMAL=y
 CONFIG_USB=y
 CONFIG_USB_HOST_ETHER=y
 CONFIG_USB_ETHER_ASIX=y