nb/intel/gm45: Define and use default MMCONF_BASE_ADDRESS

Change-Id: I2308b069b8f2c601254169bcb6a34442c537a311
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19649
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/lenovo/t400/Kconfig

@@ -35,10 +35,6 @@ config MAINBOARD_PART_NUMBER
 
 endif
 
-config MMCONF_BASE_ADDRESS
-	hex
-	default 0xf0000000
-
 config USBDEBUG_HCD_INDEX
 	int
 	default 2

src/mainboard/lenovo/x200/Kconfig

@@ -31,10 +31,6 @@ config MAINBOARD_PART_NUMBER
 	string
 	default "ThinkPad X200"
 
-config MMCONF_BASE_ADDRESS
-	hex
-	default 0xf0000000
-
 config USBDEBUG_HCD_INDEX
 	int
 	default 2

src/mainboard/roda/rk9/Kconfig

@@ -25,10 +25,6 @@ config MAINBOARD_PART_NUMBER
 	string
 	default "RK9"
 
-config MMCONF_BASE_ADDRESS
-	hex
-	default 0xf0000000
-
 config MAX_CPUS
 	int
 	default 2

src/northbridge/intel/gm45/Kconfig

@@ -39,4 +39,8 @@ config VGA_BIOS_ID
 	string
 	default "8086,2a42"
 
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xf0000000
+
 endif