thermal/core: Replace module.h with export.h

Thermal core cannot be modular, remove the unnecessary module.h include
and replace with export.h to handle EXPORT_SYMBOL family of macros.
Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/33af23406dcdb0c62dae1e6401446b997ccb449f.1589199124.git.amit.kucheria@linaro.org

drivers/thermal/thermal_core.c

@@ -9,9 +9,9 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/module.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/kdev_t.h>
 #include <linux/idr.h>