ar71xx: PowerCloud CR5000 openwrt configuration

OpenWrt configuration part of support for the PowerCloud Systems
CR5000.  The CR5000 is a dual-band 802.11n wireless router with
8MB flash, 64MB RAM, (unused on stock firmware) USB 2.0 port and
five port gigabit ethernet switch.  The CR5000 was sold as
hardware for the Skydog cloud-managed router service.

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

SVN-Revision: 47946