ARM: dts: msm: Add a boolean property for WFD writeback block for msm8974

Dedicated writeback block for WFD needs separate handling
as opposed to regular line mode writeback blocks.

Signed-off-by: Sree Sesha Aravind Vadrevu <svadrevu@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Linux 3.4.95

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: hotplug: Remove fast lane freq limit

* This is no longer needed. There are no unwanted
  spikes when device is idle.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>