Merge branch 'zhupy/fix-dropout' into 'incubate/lite'

fix arm kernel for dropout

See merge request inference/paddlelite!54

paddle/fluid/lite/kernels/arm/dropout_compute.cc

@@ -43,4 +43,5 @@ REGISTER_LITE_KERNEL(dropout, kARM, kFloat, kNCHW,
                      paddle::lite::kernels::arm::DropoutCompute, def)
     .BindInput("X", {LiteType::GetTensorTy(TARGET(kARM))})
     .BindOutput("Out", {LiteType::GetTensorTy(TARGET(kARM))})
+    .BindOutput("Mask", {LiteType::GetTensorTy(TARGET(kARM))})
     .Finalize();