acpu: add cpu underclock

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
defconfig: enable cpu underclock

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
acpu: 8064aa: add cpu underclock

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
Add frequencies to msm_dcvs.c