aarch64: setup_gnu_properties only creates the notes section when none exists

The creation of .note.gnu.property section should not be based on the
presence of GNU properties, but rather on whether this section exits
or not.
However, there is one exception to this: PR23900 [1]. Old linkers were
treating .note.gnu.property as a generic note section, so old objects
might contain properties inside .note instead of .note.gnu.property. In
this case, the section won't be detected but the properties are still
parsed. So the absence of the .note.gnu.property section is necessary
but not enough to create the section. The condition of the creation of
the section has also to include the absence of GNU properties.

[1] PR23900: https://sourceware.org/bugzilla/show_bug.cgi?id=23900

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