lenovo/r400: Add clone of Lenovo T400

The existing code for the Lenovo T400 works without changes on the
Lenovo R400.  Same HDA verbs are provided by Lenovo BIOS on both
laptops.

Change-Id: I1dadddd7250ab80a4c40c2435865d72e3e5d99c9
Signed-off-by: Michał Masłowski <mtjm@mtjm.eu>
Signed-off-by: Francis Rowe <info@gluglug.org.uk>
Reviewed-on: http://review.coreboot.org/8393
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/lenovo/r400/Kconfig

@@ -0,0 +1,7 @@
+if BOARD_LENOVO_R400
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "ThinkPad R400"
+
+endif

src/mainboard/lenovo/r400/Kconfig.name

@@ -0,0 +1,2 @@
+config BOARD_LENOVO_R400
+	bool "ThinkPad R400"

src/mainboard/lenovo/r400/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

src/mainboard/lenovo/t400/Kconfig

@@ -1,4 +1,4 @@
-if BOARD_LENOVO_T400
+if BOARD_LENOVO_T400 || BOARD_LENOVO_R400
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
@@ -27,10 +27,14 @@ config MAINBOARD_DIR
 	string
 	default lenovo/t400
 
+if BOARD_LENOVO_T400
+
 config MAINBOARD_PART_NUMBER
 	string
 	default "ThinkPad T400"
 
+endif
+
 config MMCONF_BASE_ADDRESS
 	hex
 	default 0xf0000000