xen_4.8.0.bbappend: Fix do_deploy for sstate signature
xen_4.8.0.bbappend: Fix do_deploy for sstate signature

do_deploy is based on MACHINE specific, this causes sstate signature
breakage when used with PetaLinux tools. This patch removes MACHINE from
do_deploy to make it generic

Signed-off-by: Manjukumar Matha <4c64a17569570cb9f1048973bce031c402b55312@xilinx.com>

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