nb/intel/x4x: Define and use `HOST_BRIDGE` macro

Other Intel northbridges do this.

Tested with BUILD_TIMELESS=1, Asus P5QL PRO does not change

Change-Id: I50785b7bf3e3cc0eade7fda4b4b2e2bb71a54c31
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44143
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/northbridge/intel/x4x/memmap.c b/src/northbridge/intel/x4x/memmap.c
index 8a69ba8..db0ab9c 100644
--- a/src/northbridge/intel/x4x/memmap.c
+++ b/src/northbridge/intel/x4x/memmap.c
@@ -72,7 +72,7 @@
 		{0,   0},
 	};
 
-	const u32 pciexbar_reg = pci_read_config32(PCI_DEV(0, 0, 0), D0F0_PCIEXBAR_LO);
+	const u32 pciexbar_reg = pci_read_config32(HOST_BRIDGE, D0F0_PCIEXBAR_LO);
 
 	if (!(pciexbar_reg & 1)) {
 		printk(BIOS_WARNING, "WARNING: MMCONF not set\n");
@@ -95,13 +95,13 @@
 
 static size_t northbridge_get_tseg_size(void)
 {
-	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC);
+	const u8 esmramc = pci_read_config8(HOST_BRIDGE, D0F0_ESMRAMC);
 	return decode_tseg_size(esmramc);
 }
 
 static uintptr_t northbridge_get_tseg_base(void)
 {
-	return pci_read_config32(PCI_DEV(0, 0, 0), D0F0_TSEG);
+	return pci_read_config32(HOST_BRIDGE, D0F0_TSEG);
 }