[ALSA] emu10k1 - Enable side surround channels for Audigy2 EX

Modules: EMU10K1/EMU10K2 driver

Enable side surround channels for Audigy2 EX.  Tested by Rick Wright
<riwright@vt.edu>.
Signed-off-by: Lee Revell <rlrevell@joe-job.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/emu10k1/emu10k1_main.c

@@ -714,6 +714,7 @@ static emu_chip_details_t emu_chip_details[] = {
 	 .emu10k2_chip = 1,
 	 .ca0102_chip = 1,
 	 .ca0151_chip = 1,
+	 .spk71 = 1,
 	 .spdif_bug = 1} ,
 	{.vendor = 0x1102, .device = 0x0004, .subsystem = 0x10021102,
 	 .driver = "Audigy2", .name = "Audigy 2 Platinum [SB0240P]",