[meta-xilinx] meta-xilinx rocko branch release

[Manjukumar Harthikote Matha]

Hi All,

The rocko branch in meta-xilinx has been created for the 2.4 rocko
release of Yocto/OE.

Major changes/additions:
  * Restructuring meta-xilinx to support multiple layers
     meta-xilinx
             ->meta-xilinx-bsp
             ->meta-xilinx-contrib

  * runqemu support for all machines zc702, zc706, zcu102 (sd boot)
  * Recipes for Xilinx components (xilinx-v2017.3) ATF, Kernel, u-boot, QEMU
  * pmu-firmware and boot.bin preferred providers

Known Issues:
  * GCC 7.2 support for MicroBlaze v10.0

We will add the support for MB platform and backport patches to rocko 
branch at the earliest.

Thanks to everyone that have contributed to this release:
  * Nathan Rossi
  * Alistair Francis
  * Bhargava Sreekantappa Gayathri
  * Ming Liu
  * Mike Looijmans

Thanks,
Manju