lntiq: add support for Astoria ARV7519RW.

These patches add support for the Astoria ARV7519RW aka Livebox 2.1
The PCI and PCIe interfaces have been disabled. Also, because there are
two revisions of this board with different GPHY firmwares, two targets
were defined.
V2: rewrote partitions to work with an u-boot specifically made for
these boards.

Signed off by: Esteban Benito <estebanjbs@gmail.com>
Signed off by: Carles Gadea <carlesgrg@gmail.com>
Tested by: José Vázquez Fernández <ppvazquezfer@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40329 3c298f89-4303-0410-b956-a3cf2f4a3e73