kernel-fitimage.bbclass: Adding bbclass as is from gatesgarth upstream
kernel-fitimage.bbclass: Adding bbclass as is from gatesgarth upstream

Adding kernel-fitimage.bbclass as is from gatesgarth upstream

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