msm_mpdecision: min_cpus & max_cpus should on/offline affected cpus

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
msm_mpdecision: several changes [read more]
reworked cpu_up/down handling which removed redundant code
reworked max/min_cpus settings
reworked suspend/resume handling to obide by these new changes
also reworked locking for per cpu settings

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