staging: et131x: Remove empty file Module.symvers

It was added by commit e0349d5b (staging: et131x: Remove unused rcv_pend_lock spinlock)
Signed-off-by: NDaniele Forsi <dforsi@gmail.com>
Acked-by: NMark Einon <mark.einon@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>