Fix android x64 compilation using Ninja.
Fix android x64 compilation using Ninja.

Last refactoring broke the x86_64 android target, reverting to previous
target name.

Change-Id: I5c3af42434c1864bf6309c96d69ff340b77405c5

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto