drm/msm/adreno: Use adreno_is_revn for A690

The adreno_is_revn rework came at the same time as A690 introduction
and that resulted in it not covering all cases. Fix it.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/542754/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/adreno_gpu.h

@@ -286,7 +286,7 @@ static inline int adreno_is_a660(const struct adreno_gpu *gpu)
 
 static inline int adreno_is_a690(const struct adreno_gpu *gpu)
 {
-	return gpu->revn == 690;
+	return adreno_is_revn(gpu, 690);
 };
 
 /* check for a615, a616, a618, a619 or any derivatives */