Support building host/vendor variants for tflite. am: 75e0044b0f am: 3f430203f7 am: 5edbb9f3f8 am: 1739df1069 am: 503bcf16f4

Original change: https://android-review.googlesource.com/c/platform/external/libtextclassifier/+/1566801

Change-Id: Ic676213632abb180149cc510a4d0fa6888a97a96