Add new Macv code 0x3C000000 to recognise RTL8111C.

Reference: /n/sources/patch/applied/ether8169-rtl8111c
Date: Wed Aug  5 10:27:05 CES 2009
Signed-off-by: miller@hamnavoe.com

--- /sys/src/9/pc/ether8169.c	Wed Aug  5 10:26:24 2009
+++ /sys/src/9/pc/ether8169.c	Wed Aug  5 10:26:20 2009
@@ -108,6 +108,7 @@
 	Macv14		= 0x30800000,	/* RTL8100E */
 	Macv15		= 0x38800000,	/* RTL8100E */
  	Macv16		= 0x24800000,	/* RTL8102EL */
+	Macv17		= 0x3C000000,	/* RTL8111C */
 	Macv25		= 0x28000000,	/* RTL8168D */
 	Ifg0		= 0x01000000,	/* Interframe Gap 0 */
 	Ifg1		= 0x02000000,	/* Interframe Gap 1 */
@@ -738,6 +739,7 @@
 	case Macv14:
 	case Macv15:
 	case Macv16:
+	case Macv17:
 	case Macv25:
 		break;
 	}