mb/lenovo: Add Lenovo W500 as clone of Lenovo T400

At ECC 2017 user Bob reports, that an image built for the Lenovo T500
runs on the Lenovo W500 without any issues.

Change-Id: I17fd9725ab85ba2f0c99a70f40e35432265a81c1
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/22226
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Felix Singer <migy@darmstadt.ccc.de>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/t400/Kconfig

@@ -1,4 +1,4 @@
-if BOARD_LENOVO_T400 || BOARD_LENOVO_T500 || BOARD_LENOVO_R400
+if BOARD_LENOVO_T400 || BOARD_LENOVO_T500 || BOARD_LENOVO_R400 || BOARD_LENOVO_W500
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y

src/mainboard/lenovo/w500/Kconfig

@@ -0,0 +1,7 @@
+if BOARD_LENOVO_W500
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "ThinkPad W500"
+
+endif

src/mainboard/lenovo/w500/Kconfig.name

@@ -0,0 +1,2 @@
+config BOARD_LENOVO_W500
+	bool "ThinkPad W500"

src/mainboard/lenovo/w500/board_info.txt

@@ -0,0 +1,6 @@
+Category: laptop
+ROM package: SOIC-16 or SOIC-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: n
+Clone of: lenovo/t400