pm: EDP: enable updates via sysfs

This patch allows the user space to issue E-state and threshold change
requests. E-state updates are allowed only if the change is guaranteed
to be approved.

Change-Id: Id31f06ebb95f0b1fdfce205cb17038cb7a9eb30e
Signed-off-by: Sivaram Nair <sivaramn@nvidia.com>
Reviewed-on: http://git-master/r/145256
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Reviewed-by: Juha Tukkinen <jtukkinen@nvidia.com>

Rebase-Id: R91a3a085ffb54115e0e45297b1a6716d7529260c
3 files changed