generic: add port mirroring/monitoring capability to rtl8366rb switch

This patch adds swlib attributes to the RTL8366RB switch/PHY found in the
TL-WR1043ND router that allow to mirror ethernet packets to a monitor port.

Signed-off-by: Colin Leitner <colin.leitner@googlemail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 36847