drm/msm/gpu: Add dev_to_gpu() helper

In a later patch, the drvdata will not directly be 'struct msm_gpu *',
so add a helper to reduce the churn.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/gpu/drm/msm/msm_gpu.h

@@ -144,6 +144,11 @@ struct msm_gpu {
 	bool hw_apriv;
 };
 
+static inline struct msm_gpu *dev_to_gpu(struct device *dev)
+{
+	return dev_get_drvdata(dev);
+}
+
 /* It turns out that all targets use the same ringbuffer size */
 #define MSM_GPU_RINGBUFFER_SZ SZ_32K
 #define MSM_GPU_RINGBUFFER_BLKSIZE 32