CONFIG_ACPI dependent code should include <linux/acpi.h> instead of
directly including <acpi/acpi.h>.  This patch cleans up such wrong
inclusions for Thinkpad ACPI users.
Signed-off-by: NLv Zheng <lv.zheng@intel.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>