ALSA: hda - Add SSID table for iMac7,1.

This patch add's the iMac7,1 SSID entry to
patch_realtek.c which adds sound support.
bug entry:
    https://bugs.launchpad.net/mactel-support/+bug/360866

Note:I do not have this machine on hand only
codec#0 file for the machine so please
test if you have the appropriate equipment.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>