sound: use DEFINE_PCI_DEVICE_TABLE

Use DEFINE_PCI_DEVICE_TABLE() to make PCI device ids go to
.devinit.rodata section, so they can be discarded in some cases,
and make them const.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/echoaudio/echo3g.c

@@ -81,7 +81,7 @@ static const struct firmware card_fw[] = {
 	{0, "3g_asic.fw"}
 };
 
-static struct pci_device_id snd_echo_ids[] = {
+static DEFINE_PCI_DEVICE_TABLE(snd_echo_ids) = {
 	{0x1057, 0x3410, 0xECC0, 0x0100, 0, 0, 0},	/* Echo 3G */
 	{0,}
 };