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>
diff --git a/sound/pci/echoaudio/darla20.c b/sound/pci/echoaudio/darla20.c
index 8c6db3a..a65bafe 100644
--- a/sound/pci/echoaudio/darla20.c
+++ b/sound/pci/echoaudio/darla20.c
@@ -63,7 +63,7 @@
 	{0, "darla20_dsp.fw"}
 };
 
-static struct pci_device_id snd_echo_ids[] = {
+static DEFINE_PCI_DEVICE_TABLE(snd_echo_ids) = {
 	{0x1057, 0x1801, 0xECC0, 0x0010, 0, 0, 0},	/* DSP 56301 Darla20 rev.0 */
 	{0,}
 };