plnx-deploy.bbclass: Adding support for seperate u-boot dtb
plnx-deploy.bbclass: Adding support for seperate u-boot dtb

This patch will add support to copy the u-boot.dtb
to plnx-proj/images/linux directory.

Signed-off-by: Varalaxmi Bingi <aad0206200a41ca5a4ea423e2f50c3e28ced574d@xilinx.com>
Signed-off-by: Jaewon Lee <1b369288d13b7b5cc9a37dd614e864b90fd18321@xilinx.com>

Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux