lenovo/t420: Add new port

This is based on t420s. Tested on a T420 without discrete GPU.
There is no support for nvidia gpu and optimus.

Signed-off-by: Nicolas Reinecke <nr@das-labor.org>
Tested-by: Iru Cai <mytbk920423@gmail.com>
Change-Id: Ie9405966e56180ac1c43a3c5b83181ee500177c8
Reviewed-on: https://review.coreboot.org/11765
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/lenovo/t420/board_info.txt b/src/mainboard/lenovo/t420/board_info.txt
new file mode 100644
index 0000000..c0f04ca
--- /dev/null
+++ b/src/mainboard/lenovo/t420/board_info.txt
@@ -0,0 +1,6 @@
+Category: laptop
+ROM package: SOIC-8 / WSON-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: n
+Release year: 2011