msm: kgsl: Use the first command to initiate busy

There may be multiple command submissions per-frame.  Start your
busy count only on the first one.

Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_pwrscale.h b/drivers/gpu/msm/kgsl_pwrscale.h
index 6904608..2046f78 100644
--- a/drivers/gpu/msm/kgsl_pwrscale.h
+++ b/drivers/gpu/msm/kgsl_pwrscale.h
@@ -36,6 +36,7 @@
 	struct kgsl_pwrscale_policy *policy;
 	struct kobject kobj;
 	void *priv;
+	int gpu_busy;
 };
 
 struct kgsl_pwrscale_policy_attribute {