msm: kgsl: Allow compatible string matching based on gpu models

We can have different GPU properties for different gpu models. Add
functionality to use matched GPU target from adreno_gpulist, based
on matching compatible string, available in qcom,gpu-models.

Change-Id: I55060ef60000c729d0dca6f6ae07bd76b31d5f94
Signed-off-by: Pankaj Gupta <gpankaj@codeaurora.org>