lenovo/{x60,t60}: Change PARTNUMBER for consistency

Change-Id: I0ace5f49b84170ab4701ad1b70d3c50c99066e53
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7178
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)
diff --git a/src/mainboard/lenovo/x60/Kconfig b/src/mainboard/lenovo/x60/Kconfig
index 7f8ccbf..af53c4e 100644
--- a/src/mainboard/lenovo/x60/Kconfig
+++ b/src/mainboard/lenovo/x60/Kconfig
@@ -42,7 +42,7 @@
 
 config MAINBOARD_PART_NUMBER
 	string
-	default "ThinkPad X60 / X60s / X60t"
+	default "ThinkPad X60"
 
 config MMCONF_BASE_ADDRESS
 	hex