brcm63xx: Add NuCom R5010UNv2 support

This patch adds support for the NuCom R5010UNv2.

It's a BCM6328 based board. It has an onboard BCM43217 wifi chip. For this
wifi chip looks like the brcmsmac driver isn't still supported, b43 drivers are used
for the profile of the router.

It's worth mentioning this board was affected by a bug solved with
https://dev.openwrt.org/changeset/46707



Tested-by: Angel Fontan <angel.fontan@gmail.com>
Signed-off-by: Daniel Gonzalez <dgcbueu@gmail.com>
Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 47697