ARM: dts: msm: Enable core online feature in KTM for MSM8916

All CPUs are now kept online during nominal conditions on MSM8916.
Enable core online feature in KTM for this target to explicitly
online cores when hotplug threshold is cleared.

Change-Id: Ic1f498bab5dce22bc1b482719958d2cb65b18c44
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>