uprobes/powerpc: Don't clear TIF_UPROBE in do_notify_resume()

Cleanup. No need to clear TIF_UPROBE, uprobe_notify_resume() does this.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>