tools: lib: thermal: expose thermal_exit symbols

Remove duplicate entry for thermal_init and add the missing entries for
thermal_exit and their respectives in cmd, events, and sampling context.

Signed-off-by: Emil Dahl Juhl <[e-mail]>
Signed-off-by: Sascha Hauer <[e-mail]>
Acked-by: Daniel Lezcano <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

tools/lib/thermal/libthermal.map

···
 LIBTHERMAL_0.0.1 {
 	global:
-		thermal_init;
 		for_each_thermal_zone;
 		for_each_thermal_trip;
 		for_each_thermal_cdev;
···
 		thermal_zone_find_by_id;
 		thermal_zone_discover;
 		thermal_init;
+		thermal_exit;
+		thermal_events_exit;
 		thermal_events_init;
 		thermal_events_handle;
 		thermal_events_fd;
+		thermal_cmd_exit;
 		thermal_cmd_init;
 		thermal_cmd_get_tz;
 		thermal_cmd_get_cdev;
···
 		thermal_cmd_threshold_add;
 		thermal_cmd_threshold_delete;
 		thermal_cmd_threshold_flush;
+		thermal_sampling_exit;
 		thermal_sampling_init;
 		thermal_sampling_handle;
 		thermal_sampling_fd;