staging: et131x: Remove empty file Module.symvers

It was added by commit e0349d5ba (staging: et131x: Remove unused rcv_pend_lock spinlock)

Signed-off-by: Daniele Forsi <dforsi@gmail.com>
Acked-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>