nb/nehalem: Move MMCONF_BASE_ADDRESS to a common place

Change-Id: I872959c4a38e28c29220b81c9fe029e7fc553ccf
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35435
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/nehalem/Kconfig b/src/northbridge/intel/nehalem/Kconfig
index 9c74ef6..f500d63 100644
--- a/src/northbridge/intel/nehalem/Kconfig
+++ b/src/northbridge/intel/nehalem/Kconfig
@@ -52,4 +52,8 @@
 	hex
 	default 0x10000
 
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xe0000000
+
 endif