ar71xx: Image generation for PowerCloud CR5000 Cloud Router

Kernel part of support for the PowerCloud Systems CR5000.  The
CR5000 is a dual-band 802.11n wireless router with 8MB flash,
64 MB RAM, (unused in 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: 47943