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>

src/mainboard/lenovo/x201/Kconfig

@@ -31,10 +31,6 @@ config MAINBOARD_PART_NUMBER
 	string
 	default "ThinkPad X201"
 
-config MMCONF_BASE_ADDRESS
-	hex
-	default 0xe0000000
-
 config USBDEBUG_HCD_INDEX
 	int
 	default 2

src/mainboard/packardbell/ms2290/Kconfig

@@ -30,10 +30,6 @@ config MAINBOARD_VENDOR
 	string
 	default "Packard Bell"
 
-config MMCONF_BASE_ADDRESS
-	hex
-	default 0xe0000000
-
 config USBDEBUG_HCD_INDEX
 	int
 	default 2

src/northbridge/intel/nehalem/Kconfig

@@ -52,4 +52,8 @@ config MRC_CACHE_SIZE
 	hex
 	default 0x10000
 
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xe0000000
+
 endif