AMD Trinity and Kabini: fix fan control

The fan can stop but can't run again. "AGESA: Call get_bus_conf() just
once" (commit ef40ca57) results to this problem.
This patch can resolve this problem.

Change-Id: I1b5bf3f6f7a66c60743f78918dc5442cdfc8b6e4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6981
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
AMD Hudson: enable IMC fan control using ACPI code

IMC fan control should be enabled after OS launched.
I have tested on OliveHill and Parmer with Windows 7 and Ubuntu 13.10.

Change-Id: I16d6ff6b1272d16b840e803e0a95f6e363c79704
Signed-off-by: WANG Siyuan <SiYuan.Wang@amd.com>
Signed-off-by: WANG Siyuan <wangsiyuanbuaa@gmail.com>
Reviewed-on: http://review.coreboot.org/7165
Tested-by: build bot (Jenkins)
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>