[meta-xilinx] Updates on pending Sumo release

[Manjukumar Harthikote Matha]

All,

We thought of having 2018.1 Xilinx components for Sumo release. However 
we are thinking now to pin them to 2018.2 Xilinx components, major 
reason being the
  - QEMU memfd patch in 2018.2 branch
  - ATF SPL inclusion in u-boot-xlnx code in 2018.2

We are still targeting mid-June for sumo branch cut. We have sent inital 
patches for 2018.1 Xilinx component upgrade including newlib/binutils 
upgrade.

Initial testing of sumo with upgrades seems to be stable. We plan to 
introduce few more features of this release

- Newer Xilinx components kernel v4.14, u-boot 2018.01

- MALI 400 recipe to fetch binaries from xilinx.com

- Support for newer evaluation boards from xilinx, namely zcu104, 
zcu106, Ultra96

- Support for VCU firmware binaries and kernel module

- Support for MiniZed, community contribution

- Introduce SOC variant variable as a override, this helps using the 
overrides based on architecture and helps in BSP development

Inital work is here : 
https://github.com/Xilinx/meta-xilinx/blob/rel-v2018.1/meta-xilinx-bsp/conf/machine/include/machine-xilinx-overrides.inc


Thanks,
Manju