Makefile: since misoc/migen are now in build directory HDMI2USBDIR is necessary ../../, no need for auto determine it (which seems to cause issue on a Windows machine)
Makefile: since misoc/migen are now in build directory HDMI2USBDIR is necessary ../../, no need for auto determine it (which seems to cause issue on a Windows machine)

mithro/HDMI2USB-litex-firmware,mithro/HDMI2USB-litex-firmware,cr1901/HDMI2USB-litex-firmware,cr1901/HDMI2USB-litex-firmware,cr1901/HDMI2USB-litex-firmware,cr1901/HDMI2USB-litex-firmware,mithro/HDMI2USB-litex-firmware,mithro/HDMI2USB-litex-firmware