Use device-tree instead of deviceinfo

To make this tool more universal, drop the dependency on deviceinfo by using device-tree's compatible string:

enchilada:/ # printf "%s\n" "$(cat /sys/firmware/devicetree/base/model)"
OnePlus 6
enchilada:/ # printf "%s\n" "$(cat /sys/firmware/devicetree/base/compatible )"
oneplus,enchiladaqcom,sdm845

CC: @calebccff

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