AMD K8 fam10: Refactor Kconfig SB_HT_CHAIN_ON_BUS0

If SB_HT_CHAIN_ON_BUS0 is selected, HyperTransport chain for System Bus
is the first to scan and it will be assigned with bus number 0.

If HT_CHAIN_DISTRIBUTE is selected, each link will reserve a fixed range
of bus numbers instead of assigning consecutive numbers across all the links.

All fam10 have SB_HT_CHAIN_ON_BUS0 selected under northbridge.
Follow-up can easily drop this if we find this is dictated by architecture.

Change-Id: I8deddcb4c3fd679b6b27e2879d9dba3895c4dd6f
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8366
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>

src/mainboard/msi/ms7135/Kconfig

@@ -5,6 +5,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select CPU_AMD_SOCKET_754
 	select NORTHBRIDGE_AMD_AMDK8
 	select SOUTHBRIDGE_NVIDIA_CK804
+	select HT_CHAIN_DISTRIBUTE
 	select SUPERIO_WINBOND_W83627THG
 	select HAVE_OPTION_TABLE
 	select HAVE_PIRQ_TABLE
@@ -43,10 +44,6 @@ config HT_CHAIN_END_UNITID_BASE
 	hex
 	default 0x20
 
-config SB_HT_CHAIN_ON_BUS0
-	int
-	default 2
-
 config IRQ_SLOT_COUNT
 	int
 	default 13

src/mainboard/msi/ms7260/Kconfig

@@ -6,6 +6,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select DIMM_DDR2
 	select NORTHBRIDGE_AMD_AMDK8
 	select SOUTHBRIDGE_NVIDIA_MCP55
+	select HT_CHAIN_DISTRIBUTE
 	select MCP55_USE_NIC
 	select MCP55_USE_AZA
 	select SUPERIO_WINBOND_W83627EHG
@@ -39,10 +40,6 @@ config MEM_TRAIN_SEQ
 	int
 	default 2
 
-config SB_HT_CHAIN_ON_BUS0
-	int
-	default 2
-
 config MAINBOARD_PART_NUMBER
 	string
 	default "MS-7260"

src/mainboard/msi/ms9185/Kconfig

@@ -8,6 +8,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select NORTHBRIDGE_AMD_AMDK8
 	select SOUTHBRIDGE_BROADCOM_BCM5780
 	select SOUTHBRIDGE_BROADCOM_BCM5785
+	select HT_CHAIN_DISTRIBUTE
 	select SUPERIO_NSC_PC87417
 	select HAVE_OPTION_TABLE
 	select HAVE_PIRQ_TABLE
@@ -34,10 +35,6 @@ config APIC_ID_OFFSET
 	hex
 	default 0x8
 
-config SB_HT_CHAIN_ON_BUS0
-	int
-	default 2
-
 config MAINBOARD_PART_NUMBER
 	string
 	default "MS-9185"

src/mainboard/msi/ms9282/Kconfig

@@ -33,10 +33,6 @@ config APIC_ID_OFFSET
 	hex
 	default 0x10
 
-config SB_HT_CHAIN_ON_BUS0
-	int
-	default 1
-
 config MAINBOARD_PART_NUMBER
 	string
 	default "MS-9282"

src/mainboard/msi/ms9652_fam10/Kconfig

@@ -76,10 +76,6 @@ config HT_CHAIN_END_UNITID_BASE
 	hex
 	default 0x00
 
-config SB_HT_CHAIN_ON_BUS0
-	int
-	default 1
-
 config VAR_MTRR_HOLE
 	bool
 	default n