ARM: dts: msm: Add GPU speed bin support for QM215

There are multiple gpu speed bin values for QM215.
Add available gpu speed bins to support respective
GPU max clock frequencies.

Change-Id: I3a4b5f17f9ee77223dfde4d37b80e36377743bab
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>