Rename so file to match soname (pytorch#3810)

Summary: Pull Request resolved: pytorch#3810

Test Plan: Use artifact from https://gha-artifacts.s3.amazonaws.com/pytorch/executorch/9356134478/artifact/executorch-llama.aar to build demo app

Reviewed By: shoumikhin

Differential Revision: D58100605

Pulled By: kirklandsign

fbshipit-source-id: a1febda12a546b7bf53c1059a603fece0e5553c5

Author: kirklandsign

build/test_android_ci.sh

@@ -45,9 +45,11 @@ build_aar() {
    \<uses-sdk android:minSdkVersion=\"19\" /\> \
    \</manifest\> > build_aar/AndroidManifest.xml
   pushd build_aar
+  mv jni/arm64-v8a/libexecutorch_jni.so jni/arm64-v8a/libexecutorch.so
+  mv jni/x86_64/libexecutorch_jni.so jni/x86_64/libexecutorch.so
   zip -r executorch.aar libs jni AndroidManifest.xml
 
-  rm jni/arm64-v8a/libexecutorch_jni.so jni/x86_64/libexecutorch_jni.so
+  rm jni/arm64-v8a/libexecutorch.so jni/x86_64/libexecutorch.so
   zip -r executorch-llama.aar libs jni AndroidManifest.xml
   popd
 }