ALSA: hda - make laptop-eapd model back for AD1986A

The changes specific for Samsung laptops seem unapplicable to other
hardware models like ASUS.  The mic inputs are lost on such hardware
by the change 5d5d5f43.

This patch adds back the old laptop-eapd model, and create a new
model "samsung" for the new one specific to Samsung laptops with
automatic mic selection feature.

Reference: kernel bugzilla #12070
	http://bugzilla.kernel.org/show_bug.cgi?id=12070



Signed-off-by: Takashi Iwai <tiwai@suse.de>