mb/lenovo/*/devicetree: Add BDC detection support

Add support for BDC detection, based on the schematics for each board.
Support for boards without schematics needs further testing.

Needs test on all boards.

Change-Id: If33ef88fb808f36b050393fa83eb1b541ce936b9
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19810
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
diff --git a/src/mainboard/lenovo/x60/devicetree.cb b/src/mainboard/lenovo/x60/devicetree.cb
index 50b0d56..cf319a3 100644
--- a/src/mainboard/lenovo/x60/devicetree.cb
+++ b/src/mainboard/lenovo/x60/devicetree.cb
@@ -134,6 +134,10 @@
 					register "eventb_enable" = "0xff"
 					register "eventc_enable" = "0xff"
 					register "eventd_enable" = "0xff"
+
+					register "has_bdc_detection" = "1"
+					register "bdc_gpio_num" = "7"
+					register "bdc_gpio_lvl" = "0"
 				end
 				chip superio/nsc/pc87382
 					device pnp 164e.2 on # IR