i82801ix,bd82x6x,ibexpeak: rewrite expresscard hotplug

This implementation is more compact, unified and works with windows as well.

Tested under windows and under Debian GNU/Linux.

Change-Id: I585dec12e17e22d829baa3f2dc7aecc174f9d3b5
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7296
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Nicolas Reinecke <nr@das-labor.org>
Tested-by: build bot (Jenkins)
diff --git a/src/mainboard/lenovo/t520/devicetree.cb b/src/mainboard/lenovo/t520/devicetree.cb
index d347e82..065261a 100644
--- a/src/mainboard/lenovo/t520/devicetree.cb
+++ b/src/mainboard/lenovo/t520/devicetree.cb
@@ -76,6 +76,8 @@
 			register "c2_latency" = "101"  # c2 not supported
 			register "p_cnt_throttling_supported" = "1"
 
+			register "pcie_hotplug_map" = "{ 0, 0, 0, 1, 0, 0, 0, 0 }"
+
 			device pci 16.0 on end # Management Engine Interface 1
 			device pci 16.1 off end
 			device pci 16.2 off end