增加支持hp & spk 自动切换

hc

2024-03-22 619f0f87159c5dbd2755b1b0a0eb35784be84e7a

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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