ARM: dts: msm: fix PU feature enabling for sdm670

In the current implementation Partial Update feature
node parsing is moved to timing information node. So,
fix the partial update feature enabling for sdm670 by
moving the node to correct place.

Change-Id: Ia33363b264f8f89eaa28b1c77c3b413892fa87b9
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>