Since we've switched to the LED trigger for binding with HD-audio,
we can drop the exported function as well as the whole
linux/thinkpad_acpi.h.

The own TPACPI_LED_MUTE and TPACPI_LED_MICMUTE definitions are
replaced with the identical ones for LEDS, i.e. LED_AUDIO_MUTE and
LED_AUDIO_MICMUTE, respectively.  They are no longer needed as
referred only locally.
Acked-by: NJacek Anaszewski <jacek.anaszewski@gmail.com>
Acked-by: NPavel Machek <pavel@ucw.cz>
Acked-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: NHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: NPali Rohár <pali.rohar@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>