One awincnt0 is enough
add HDMI audio driver
enable awinhdmiaudio
AWIN_HDMI_ADMA_CTRL_FIFO_CLEAR causes playback to stop working, dont set it
awinhdmiaudio(4): Add support for Allwinner A20/A31 HDMI audio controller.
only dump regs when enabling audio if AWIN_HDMI_DEBUG