ALSA: hda - Change BTL amp level on some HP notebooks

Some HP laptops have lower amplifier levels for speakers in comparison
with headphone outputs.  This patch changes the BTL amp level for these
machines to balance both the speaker and headphone output levels.

Signed-off-by: Vitaliy Kulikov <Vitaliy.Kulikov@idt.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>