nb/intel/haswell: Add a PCI ID for a desktop memory controller

The PCI ID was taken from the output of `lspci` on an ASRock H81M-HDS.

Change-Id: Ie162cb7a27e313ffe612659e8444657a3772d3c9
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/29378
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/haswell/haswell.h

@@ -210,6 +210,7 @@ struct ied_header {
 	u8 reserved[34];
 } __packed;
 
+#define PCI_DEVICE_ID_HSW_DESKTOP 0x0c00
 #define PCI_DEVICE_ID_HSW_MOBILE 0x0c04
 #define PCI_DEVICE_ID_HSW_ULT 0x0a04