!13731 [lite]fix fp16 gather bug

From: @xu_anyue
Reviewed-by: @hangangqiang,@zhanghaibo5
Signed-off-by: @hangangqiang

mindspore/lite/src/runtime/kernel/arm/fp16/gather_fp16.cc

@@ -45,7 +45,7 @@ int GatherFp16CPUKernel::Init() {
       reinterpret_cast<float16_t *>(context_->allocator->Malloc(input_tensor->ElementsNum() * sizeof(float16_t)));
     Float32ToFloat16(reinterpret_cast<float *>(input_tensor->data_c()), input_data_, input_tensor->ElementsNum());
   }
-
+  (reinterpret_cast<GatherParameter *>(op_parameter_))->axis_ = *static_cast<int *>(in_tensors_.at(2)->data_c());
   if (!InferShapeDone()) {
     return RET_OK;
   }