Revert "Enforce <uses-library> checks for android_app and android_app_import."

This reverts commit 22890c466e.

Reason for revert: Broken build 7065627 on git_rvc-qpr-dev-plus-aosp
  on aosp_sunfish-userdebug branch.

Bug: 176892941
Test: treehugger
Change-Id: I0f5da13644fd2ec7b0472fe82918e3c6a72d953c

java/app_import.go

@@ -430,8 +430,6 @@ func AndroidAppImportFactory() android.Module {
 	android.InitDefaultableModule(module)
 	android.InitSingleSourcePrebuiltModule(module, &module.properties, "Apk")
 
-	module.usesLibrary.enforce = true
-
 	return module
 }