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/ibase/mb899/devicetree.cb b/src/mainboard/ibase/mb899/devicetree.cb
index c304908..a26d7c2 100644
--- a/src/mainboard/ibase/mb899/devicetree.cb
+++ b/src/mainboard/ibase/mb899/devicetree.cb
@@ -32,6 +32,9 @@
 			register "ide_enable_secondary" = "0x0"
 			register "sata_ahci" = "0x1"
 
+			register "c3_latency" = "85"
+			register "p_cnt_throttling_supported" = "0"
+
 			#device pci 1b.0 on end # High Definition Audio
 			device pci 1c.0 on end # PCIe
 			device pci 1c.1 on end # PCIe