ARM: dts: msm: Update GPU chipid for SDM636

The SDM636 GPU is similar to SDM660 but different
because of GPU clock plan. Update SDM636 GPU ID to
A509 so that we can handle it.

Change-Id: I8ed4403a5a11b5cb92827716d8f1e9655403c8bf
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>