lenovo: Handle EEPROM/RFID chip.

EEPROM/RFID chip present in thinkpad should be locked in a way to avoid
any potential RFID access.

Read serial number, UUID and P/N from EEPROM.

This info is stored on AT24RF08 chip acessible through SMBUS.

Change-Id: Ia3e766d90a094f63c8c854cd37e165221ccd8acd
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4774
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
diff --git a/src/mainboard/lenovo/x201/devicetree.cb b/src/mainboard/lenovo/x201/devicetree.cb
index a8831c2..37a430c 100644
--- a/src/mainboard/lenovo/x201/devicetree.cb
+++ b/src/mainboard/lenovo/x201/devicetree.cb
@@ -145,6 +145,17 @@
 			end
 			device pci 1f.3 on # SMBUS
 				subsystemid 0x17aa 0x2167
+			        # eeprom, 8 virtual devices, same chip
+				chip drivers/i2c/at24rf08c
+					device i2c 54 on end
+					device i2c 55 on end
+					device i2c 56 on end
+					device i2c 57 on end
+					device i2c 5c on end
+					device i2c 5d on end
+					device i2c 5e on end
+					device i2c 5f on end
+				end
 			end
 		end
 	end