mpdec: FIX BUG#27

Unplugging a boosted CPU will cause it to come back with
the boosted minimum frequency and stay on it.
(it gets stuck on boost)

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
mpdec: if !scroff_single_core unboost all cpus while suspending

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
mpdec: fix missing log message on resume if !scroff_single_core

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>