recipes-kernel:linux-xlnx: Adjust kernel to use xlnx_3.8 branch

linux-xlnx has an xlnx_3.8 branch, adjust the recipe to us it.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
boards/common/zynq-7-base.dtsi: Updated for 'xlnx_3.8' kernel

* Updated various nodes with newer properties and clock information
* Fixed up compatible properties for some nodes
* Refactored out some board specific properties
* Cleaned up some style inconsistency

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
boards/zc702: Updated device-tree

* Added additional node properties for board specific setup

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
boards/zc706: Updated device-tree

* Added additional node properties for board specific setup
* Fixed up QSPI flash properties for ZC706 flash configuration
* Fixed up incorrect setup of I2C sub nodes

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
boards/zedboard: Updated device-tree

* Added additional node properties for board specific setup

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
recipes-kernel:linux-yocto: Remove a few redundant kc705 scc files.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
recipes-kernel:linux-yocto: Adjust recipes and patches to match xlnx_3.8.

Utilise the xlnx_3.8 branch sources on linux-xlnx.git instead of master.
Adjust linux-yocto recipes and include additional patches accordingly.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
recipes-kernel:linux-xlnx: Adjust SRCREV on xlnx_3.8 branch.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
recipes-kernel:linux-xlnx: Adjust SRCREV for linux-xlnx_3.10

Adjust source revision for linux-xlnx_3.10 recipe to match linux-xlnx.git
tag Xilinx-v14.5.

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
u-boot-xlnx_git.bb: Remove use of SRCPV in PV

* This removes the reliance on the SRCPV during recipe parsing, which
  in turn removes the need for the parsing process to request
  information from the git server.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
recipes-kernel:linux-xlnx: Update SRCREV for linux-xlnx_3.8

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
recipes-kernel:linux-yocto: Adjust xlnx_3.8 patch file.

Adjust patch file to match new linux-xlnx_3.8 SRCREV.
Also remove now redundant patch (included in adjusted patch).

Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>