[brcm63xx] Fixed Comtrend CT536_CT5621 board settings. These boards are based on...

[brcm63xx] Fixed Comtrend CT536_CT5621 board settings.   These boards are based on the 96348GW-11 reference design but have different GPIOs therefore we use the board fixups now availabed (thanks the patches by Jonas Gorski) to create a separate board entry for these boards and leave the reference design with reference GPIOs.  Also these boards only have enet1 (no enet0) so we set that in the board definition, and use a defconfig for a single interface network.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24442 3c298f89-4303-0410-b956-a3cf2f4a3e73