ar71xx: PowerCloud CR3000 OpenWrt configuration

OpenWRt configuration part of support for the PowerCloud
Systems CR3000.  The CR3000 is a 802.11n 2.4 GHz wireless router with
8MB flash, 64MB RAM, a four port gigabit ethernet switch, and a fast
ethernet wan port that was sold by PowerCloud Systems as
hardware for the Skydog cloud-managed router service.

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

SVN-Revision: 47945