msm: dcvs: add sysfs parameter for active and leakage offsets

The active and leakage energy offsets for each frequency are
best left configurable from userspace to make tuning easier.

Change-Id: I435a30d46cc02861dd7e8371b21d0433c0aa6a28
Signed-off-by: Steve Muckle <smuckle@codeaurora.org>