[ALSA] hda - Fix resume of auto-config mode with Realtek codecs

The auto-config mode of Realtek ALC codecs has a bug since 2.6.25
that it cannot resume properly.  The problem was the wrong assignment
of init_hook that overrides the whole initialization.

Relevant bug reports:
	http://bugzilla.kernel.org/show_bug.cgi?id=10662
	https://bugzilla.novell.com/show_bug.cgi?id=385473

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