[TFLite] Add gemmlowp to install CMake deps
Currently gemmlowp is not included in the dependencies for the CMake file that is created by the install target which causes link time failures when linked against TFLite in certain contexts.

This is causing build failures when trying to build LLVM with a near tip of tree TFLite:

```
CMake Error at /tflite/tensorflow/lib/cmake/tensorflow-lite/tensorflow-liteTargets.cmake:89 (set_target_properties):
  The link interface of target "tensorflow-lite::tensorflow-lite" contains:

    gemmlowp::gemmlowp
```

Related to https://github.com/google/ml-compiler-opt/pull/293

CC: @mtrofin @petrhosek 