msm: dcvs_idle: Provide CPU core idle information to msm_dcvs
The msm_dcvs algorithm takes in core idle information and outputs the
frequency for the core to run at. This driver registers with the
CPU_PM interface to get the idle enter and idle exit notification and
passes this to the msm_dcvs driver for every CPU core.

Change-Id: I2b7ddbae2ac00f7c129d307022f8b1b928e2956e
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>
adapted and modified for 8660 targets by faux123

https://github.com/faux123/msm8660-htc-ics/commit/97e223bdde2e35209e19f0ca1006dc5875b46c0f