alix2: add support for alix6

The Alix6 is very similar to the alix2, differing in having 1 mini-PCIe
slot (USB 2.0 only), an RFKILL GPIO line going to that slot, and 1 or 2
SIM sockets.

Change-Id: I19e4e756966e60bb0310c19286654d3d579b8850
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
Reviewed-on: http://review.coreboot.org/521
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/mainboard/pcengines/Kconfig b/src/mainboard/pcengines/Kconfig
index 6c6646d..e967267 100644
--- a/src/mainboard/pcengines/Kconfig
+++ b/src/mainboard/pcengines/Kconfig
@@ -7,6 +7,8 @@
 	bool "ALIX.1C"
 config BOARD_PCENGINES_ALIX2D
 	bool "ALIX.2D2 or 2D3"
+config BOARD_PCENGINES_ALIX6
+	bool "ALIX.6"
 
 endchoice
 
diff --git a/src/mainboard/pcengines/alix2d/Kconfig b/src/mainboard/pcengines/alix2d/Kconfig
index c2e4b2e..2343d70 100644
--- a/src/mainboard/pcengines/alix2d/Kconfig
+++ b/src/mainboard/pcengines/alix2d/Kconfig
@@ -1,4 +1,4 @@
-if BOARD_PCENGINES_ALIX2D
+if BOARD_PCENGINES_ALIX2D || BOARD_PCENGINES_ALIX6
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
@@ -18,10 +18,11 @@
 
 config MAINBOARD_PART_NUMBER
 	string
-	default "ALIX.2D"
+	default "ALIX.2D" if BOARD_PCENGINES_ALIX2D
+	default "ALIX.6" if BOARD_PCENGINES_ALIX6
 
 config IRQ_SLOT_COUNT
 	int
 	default 7
 
-endif # BOARD_PCENGINES_ALIX2D
+endif # BOARD_PCENGINES_ALIX2D || BOARD_PCENGINES_ALIX6