mimas_a7: add bridge_net target
mimas_a7: add bridge_net target

Signed-off-by: Rohit Singh <6ceda7e05522ab1ffa85567e8d4e2bc048e6b44c@gmail.com>

mithro/HDMI2USB-litex-firmware,mithro/HDMI2USB-litex-firmware,mithro/HDMI2USB-litex-firmware,mithro/HDMI2USB-litex-firmware