Move the logic of using prebuilt tradefed to build/core/task

# Copyright (C) 2020 The Android Open Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

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ifeq (,$(wildcard tools/tradefederation/core))

.PHONY: tradefed-core

tradefed-core: tradefed atest_tradefed.sh

.PHONY: tradefed-all

tradefed-all: tradefed atest_tradefed.sh

$(call dist-for-goals, tradefed, $(HOST_OUT)/etc/tradefed.zip)

endif