add vid/did for the intel c220 hda audio part

Reference: /n/atom/patch/applied/hda220nix
Date: Thu Jun 12 20:30:48 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/audiohda.c	Thu Jun 12 20:30:38 2014
+++ /sys/src/nix/k10/audiohda.c	Thu Jun 12 20:30:38 2014
@@ -1569,6 +1569,7 @@
 		case 0x8086<<16 | 0x080a:	/* Intel SCH Oaktrail */
 		case 0x8086<<16 | 0x1c20:		/* Intel PCH */
 		case 0x8086<<16 | 0x1e20:	/* Intel (Thinkpad x230t) */
+		case 0x8086<<16 | 0x8c20:		/* Intel 8 Series/C220 Series */
 
 		case 0x10de<<16 | 0x026c:	/* NVidia MCP51 untested */
 		case 0x10de<<16 | 0x0371:	/* NVidia MCP55 untested */
@@ -1683,6 +1684,7 @@
 		case 0x1e20:
 		case 0x811b:	/* SCH */
 		case 0x080a:
+		case 0x8c20:
 			pcicfgw16(p, 0x78, pcicfgr16(p, 0x78) & ~0x800);
 		}
 	}