make toco build for android (#17885)

* make toco build for android

for ARMv8
`
bazel build --config android_arm64 --cxxopt=-std=c++11 --linkopt="-llog" //tensorflow/contrib/lite/toco:toco   --config monolithic
`
for ARMv7a
`
bazel build --config android_arm --cxxopt=-std=c++11 --linkopt="-llog" //tensorflow/contrib/lite/toco:toco   --config monolithic
`

* revert out-of-tflite patch

will do it in another PR

* revert out-of-tflite patch

will do it in another PR