[pytorch] build torch for libtorch mobile build #21234
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Stack from ghstack:
Summary:
Since recent unification of caffe2 and torch library we stop building
torch for mobile. This diff re-enables torch build for libtorch mobile
build unless BUILD_CAFFE2_MOBILE is set to TRUE.
BUILD_CAFFE2_MOBILE is used to build old libcaffe2 library which will
be deprecated. We can remove these conditions after the deprecation.
Test Plan:
Build mobile library and make sure it can run pytorch model on Android.
Differential Revision: D15616540