Add MMCONF resource to AMD fam15tn PCI_DOMAIN

In the process of verifying change it was discovered the MMCONF
default base address 0xA0000000 was set below mem_top 0xE0000000
and bus number 256 wasn't a relistic number. The Kconfig defaults were
changed to mirror fam15 defaults base address 0xF8000000 and bus
number 64. Verified changes with boot to OS.

This is a port of the following:
commit d5c998be99709c92f200b3b08aed2ca3fee2d519

	The coreboot resource allocator doesn't respect resources
	claimed in the APIC_CLUSTER. Move the MMCONF resource to the
	PCI_DOMAIN to prevent overlap with PCI devices.

original-Change-Id: I8541795f69bbdd9041b390103fb901d37e07eeb9
    Signed-off-by: Marc Jones <marc.jones@se-eng.com
    URL - http://review.coreboot.org/#/c/2167/

Change-Id: I47660061538f8889f528b9b880a82645074886a7
Signed-off-by: Steven Sherk <steven.sherk@se-eng.com>
Reviewed-on: http://review.coreboot.org/2260
Tested-by: build bot (Jenkins)
Reviewed-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-by: Marc Jones <marcj303@gmail.com>
diff --git a/src/northbridge/amd/agesa/family15tn/Kconfig b/src/northbridge/amd/agesa/family15tn/Kconfig
index b78b01d..5f08593 100644
--- a/src/northbridge/amd/agesa/family15tn/Kconfig
+++ b/src/northbridge/amd/agesa/family15tn/Kconfig
@@ -33,10 +33,10 @@
 
 config MMCONF_BASE_ADDRESS
 	hex
-	default 0xA0000000
+	default 0xF8000000
 
 config MMCONF_BUS_NUMBER
 	int
-	default 256
+	default 64
 
 endif