i82801gx: Handle whole FADT in southbridge.

Do all the handling in SB code with few parameters from devicetree.cb
instead of having mobo callbacks.

Change-Id: I8fd02ff05553a3c51ea5f6ae66b8f5502509e2bc
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7199
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
diff --git a/src/mainboard/lenovo/t60/devicetree.cb b/src/mainboard/lenovo/t60/devicetree.cb
index f092380..643cc7c 100644
--- a/src/mainboard/lenovo/t60/devicetree.cb
+++ b/src/mainboard/lenovo/t60/devicetree.cb
@@ -70,6 +70,9 @@
 			register "alt_gp_smi_en" = "0x1000"
 
 			register "c4onc3_enable" = "1"
+			register "c3_latency" = "0x23"
+			register "docking_supported" = "1"
+			register "p_cnt_throttling_supported" = "1"
 
 			device pci 1b.0 on # Audio Controller
 				subsystemid 0x17aa 0x2010