main/busybox: Add serial consoles to securetty
Add to securetty file the serial consoles related to the following devices:
- NVIDIA Jetson Xavier NX developer kit
- Lenovo ThinkEdge SE70
- phyBOARD-Pollux board (i.MX8M Plus SoC)
- Advantech EPC-R3720 (i.MX8M Plus SoC)
- Rockchip RK3399 developer kit
These devices are supported by EVE-OS (https://github.com/lf-edge/eve), which uses Alpine for package management and as base distro.
Signed-off-by: Renê de Souza Pinto rene@renesp.com.br