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/mmcblk1p1 rw rootwait
fdt_addr=0x1000000
fdt_high=0xffffffffffffffff
fdt_name=boot/armada-8040-mcbin.dtb
kernel_addr=0x2000000
image_name=boot/Image
bootcmd=mmc dev 1; ext4load mmc 1:1 $kernel_addr $image_name; ext4load mmc 1:1 $fdt_addr $fdt_name; booti $kernel_addr - $fdt_addr