add bootargs root

hc

2023-02-14 89db217f27d1d16339e417d7db6cfc7341442919

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default buildroot
 
label buildroot
kernel /boot/uImage
devicetree /boot/imx6dl-riotboard.dtb
append console=ttymxc1,115200 root=/dev/mmcblk0p1 rw