add bootargs root

hc

2023-02-14 89db217f27d1d16339e417d7db6cfc7341442919

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default firefly-rk3288
 
label firefly-rk3288
kernel /boot/uImage
devicetree /boot/rk3288-firefly.dtb
append console=ttyS2,115200n8 root=/dev/mmcblk0p1 rootwait