ARM: dts: msm: Change min DDR freq for GPU turbo for titanium

To improve performance vote for turbo DDR freq when GPU is
running at turbo corner.

Change-Id: Idfd71538f50a8735b9b1d9f9423f7210bb925006
Signed-off-by: Prakash Kamliya <pkamliya@codeaurora.org>