targets/ice40_up5k_b_evn: Enable CAS module. Closes #92.
targets/ice40_up5k_b_evn: Enable CAS module. Closes #92.

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