acpuclock: initial overclock to 2.5 Ghz
acpuclock: fix OC for pvs0 - duh stay within voltage constraints
acpuclock: tune
EXPERIMENTAL: acpuclock: tweak L2 bus bw and overclock 2.8ghz slot

* not likely stable for most people
acpuclock: remove L2 tweak but keep 2.8ghz slot