u-boot-xilinx: uboot for xilinx virtex4 virtex5 targets

u-boot-xilinx: uboot for xilinx virtex4 virtex5 targets

* u-boot for xilinx platforms virtex4, virtex5 based
* Inherits xilinx-bsp.bbclass for passing xparameters
  header file from hardware reference design project
  to match hardware/software model
* v2 reorder patch set

Signed-off-by: Adrian Alonso <aalonso00@gmail.com>
Acked-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>