[ALSA] HDA Codecs: add support for Toshiba Equium L30

This patch adds support for the Toshiba Equium L30 laptop and renames the mixer
controls to match Laptop usages.

Signed-off-by: Tobin Davis <tdavis@dsl-only.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>