Makefile: Fix adding intel/common

Directory intel/common must be conditionally added in the list
of source directories, as the parent directory southbridge/intel
is unconditionally added even for boards without such device.

Change-Id: I7088bc6db9f56909ffa996aa7eff76cd72e177eb
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3827
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/southbridge/intel/Kconfig

@@ -1,3 +1,4 @@
+source src/southbridge/intel/common/Kconfig
 source src/southbridge/intel/esb6300/Kconfig
 source src/southbridge/intel/i3100/Kconfig
 source src/southbridge/intel/i82371eb/Kconfig

src/southbridge/intel/Makefile.inc

@@ -1,4 +1,4 @@
-subdirs-y += common
+subdirs-$(CONFIG_SOUTHBRIDGE_INTEL_COMMON) += common
 subdirs-$(CONFIG_SOUTHBRIDGE_INTEL_ESB6300) += esb6300
 subdirs-$(CONFIG_SOUTHBRIDGE_INTEL_I3100) += i3100
 subdirs-$(CONFIG_SOUTHBRIDGE_INTEL_I82371EB) += i82371eb

src/southbridge/intel/bd82x6x/Kconfig

@@ -27,6 +27,7 @@ if SOUTHBRIDGE_INTEL_BD82X6X || SOUTHBRIDGE_INTEL_C216
 
 config SOUTH_BRIDGE_OPTIONS # dummy
 	def_bool y
+	select SOUTHBRIDGE_INTEL_COMMON
 	select IOAPIC
 	select HAVE_HARD_RESET
 	select HAVE_USBDEBUG

src/southbridge/intel/common/Kconfig

@@ -0,0 +1,2 @@
+config SOUTHBRIDGE_INTEL_COMMON
+	def_bool n

src/southbridge/intel/i82801dx/Kconfig

@@ -21,6 +21,7 @@
 
 config SOUTHBRIDGE_INTEL_I82801DX
 	bool
+	select SOUTHBRIDGE_INTEL_COMMON
 	select IOAPIC
 	select HAVE_HARD_RESET
 	select HAVE_SMI_HANDLER

src/southbridge/intel/i82801ex/Kconfig

@@ -1,5 +1,6 @@
 config SOUTHBRIDGE_INTEL_I82801EX
 	bool
+	select SOUTHBRIDGE_INTEL_COMMON
 	select IOAPIC
 	select HAVE_HARD_RESET
 	select HAVE_USBDEBUG

src/southbridge/intel/i82801gx/Kconfig

@@ -19,6 +19,7 @@
 
 config SOUTHBRIDGE_INTEL_I82801GX
 	bool
+	select SOUTHBRIDGE_INTEL_COMMON
 	select IOAPIC
 	select HAVE_HARD_RESET
 	select HAVE_USBDEBUG

src/southbridge/intel/i82801ix/Kconfig

@@ -20,6 +20,7 @@
 
 config SOUTHBRIDGE_INTEL_I82801IX
 	bool
+	select SOUTHBRIDGE_INTEL_COMMON
 	select IOAPIC
 	select HAVE_USBDEBUG
 	select HAVE_HARD_RESET

src/southbridge/intel/lynxpoint/Kconfig

@@ -24,6 +24,7 @@ if SOUTHBRIDGE_INTEL_LYNXPOINT
 
 config SOUTH_BRIDGE_OPTIONS # dummy
 	def_bool y
+	select SOUTHBRIDGE_INTEL_COMMON
 	select IOAPIC
 	select HAVE_HARD_RESET
 	select HAVE_USBDEBUG

src/southbridge/intel/sch/Kconfig

@@ -19,6 +19,7 @@
 
 config SOUTHBRIDGE_INTEL_SCH
 	bool
+	select SOUTHBRIDGE_INTEL_COMMON
 	select HAVE_USBDEBUG
 	select HAVE_HARD_RESET
 	select HAVE_SMI_HANDLER