add do1-do7 di1 procfs

hc

2023-10-12 3124110e504ba82e43686669ed7188bcdbe72744

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# from https://www.kernel.org/pub/software/utils/dtc/sha256sums.asc
sha256 470731d5c015b160d26a96645dbb1c7337d6e7b8c98244612002b66bedf6cffb  dtc-1.4.4.tar.xz