ACPI / fan: remove unused macro

The _COMPONENT, ACPI_MODULE_NAME(name) and ACPI_FAN_FILE_STATE are not
used anywhere so remove them.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/acpi/fan.c

@@ -34,10 +34,6 @@
 #define PREFIX "ACPI: "
 
 #define ACPI_FAN_CLASS			"fan"
-#define ACPI_FAN_FILE_STATE		"state"
-
-#define _COMPONENT		ACPI_FAN_COMPONENT
-ACPI_MODULE_NAME("fan");
 
 MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI Fan Driver");