dfx-mgr: Fix override syntax
dfx-mgr: Fix override syntax

Fix override syntax in systemd variables.

Signed-off-by: Christian Kohn <cddab1f837c400ff9c3b002761e2cb74669ec6d1@xilinx.com>
Signed-off-by: Mark Hatle <41765ab18fb75e64ff0efe27f2ebcdb2d6f7e44e@xilinx.com>

Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx