nb/intel/haswell: Move MMCONF_BASE_ADDRESS to northbridge Kconfig

Change-Id: I44f27405fc8ccbe54c7d19b70327da866390a156
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/28603
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Tristan Corrick <tristan@corrick.kiwi>

src/northbridge/intel/haswell/Kconfig

@@ -36,6 +36,10 @@ config VGA_BIOS_ID
 	string
 	default "8086,0166"
 
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xf0000000
+
 config CACHE_MRC_SIZE_KB
 	int
 	default 512