nb/intel/sandybridge: replace NORTHBRIDGE with HOST_BRIDGE define

The two defines are identical, so deduplicate this.

Timeless build for lenovo/x230 results in identical binary.

Change-Id: I32e0eee88d72eb6f8dc71b0324d62f46079120a9
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38579
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index c69c827..7136cd4 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -497,7 +497,6 @@
 	}
 }
 
-#define HOST_BRIDGE	PCI_DEV(0, 0, 0)
 #define DEFAULT_TCK	TCK_800MHZ
 
 unsigned int get_mem_min_tck(void)
@@ -595,7 +594,7 @@
 
 	mmiosize = get_mmio_size();
 
-	ggc = pci_read_config16(NORTHBRIDGE, GGC);
+	ggc = pci_read_config16(HOST_BRIDGE, GGC);
 	if (!(ggc & 2)) {
 		gfxstolen = ((ggc >> 3) & 0x1f) * 32;
 		gttsize = ((ggc >> 8) & 0x3);