ar71xx: create 'fat' images for the DIR-825/TEW-673GRU boards

ar71xx: create 'fat' images for the DIR-825/TEW-673GRU boards

With these images, it is possible to use the 'unused'
partition of the flash. The 'fat' images can be installed
with the sysupgrade command. When a 'fat' image is
installed from a regular one, the platform specific
sysupgrade script copies the calibration data to the
end of the flash. Likewise, when a regular image is
installed  from the 'fat' version the sysupgrade script
copies the calibration data back to the original location.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33540 3c298f89-4303-0410-b956-a3cf2f4a3e73