soc/intel/broadwell: Define and use MMCONF_BUS_NUMBER

Note that ACPI MCFG generation reported too many busses.

Change-Id: I5acd26bac675cc818df46f60887f90b76f4580a2
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50034
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/broadwell/pei_data.c b/src/soc/intel/broadwell/pei_data.c
index 9d7a522..48800ed 100644
--- a/src/soc/intel/broadwell/pei_data.c
+++ b/src/soc/intel/broadwell/pei_data.c
@@ -15,7 +15,7 @@
 	pei_data->pei_version = PEI_VERSION;
 	pei_data->board_type = BOARD_TYPE_ULT;
 	pei_data->usbdebug = CONFIG(USBDEBUG);
-	pei_data->pciexbar = MCFG_BASE_ADDRESS;
+	pei_data->pciexbar = CONFIG_MMCONF_BASE_ADDRESS;
 	pei_data->smbusbar = CONFIG_FIXED_SMBUS_IO_BASE;
 	pei_data->ehcibar = EARLY_EHCI_BAR;
 	pei_data->xhcibar = EARLY_XHCI_BAR;