drm/msm/adreno: Add A635 speedbin 0xac (A643)

Downstream calls this the "speedbin 1", but that number is already
occupied. Use index two.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/559607/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/adreno_device.c

@@ -460,6 +460,7 @@ static const struct adreno_info gpulist[] = {
 		.speedbins = ADRENO_SPEEDBINS(
 			{ 0,   0 },
 			{ 117, 0 },
+			{ 172, 2 }, /* Called speedbin 1 downstream, but let's not break things! */
 			{ 190, 1 },
 		),
 	}, {