add audio

hc

2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

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bootargs=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait video=Unknown-1:800x480-16
bootcmd=fatload mmc 0:1 0x21000000 at91sam9g35ek.dtb; fatload mmc 0:1 0x22000000 zImage; bootz 0x22000000 - 0x21000000
bootdelay=1
ethact=gmac0
stderr=serial
stdin=serial
stdout=serial