machine/boards/common: Created MicroBlaze 3.10 defconfig

* Cloned from the 3.8 configuration.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
linux-dtb.inc: Fix-up PACKAGES variable for QA issues

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
linux-xlnx.inc: Remove use of "linux-yocto"

* Remove the dependence on the linux-yocto.inc and linux-yocto classes.
* This change is made to make linux-xlnx less dependent on features that
  are provided by the linux-yocto recipes, and in turn make the
  linux-xlnx recipe more portable.
* Fix-up the individual .bb files where required.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
qemuzynq.dts: Fix issue preventing proper boot of qemuzynq

* '137abefc80c2bd240960ae16626ed6564a8a9196' introduced a fix to the
  register mapping of the ps7-adc node, this fix allows Linux to attempt
  to correctly probe the xadc peripheral however QEMU does not emulate
  this device.
* Invalidate node for qemuzynq platform to allow the kernel to correctly
  boot.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>