Mainlining the reMarkable 2 eInk tablet

" summary

Covers adding reMarkable 2 support to mainline Linux for the i.MX7-based eInk tablet; explains reverse-engineering its vendor stack (a forked 4.14 kernel with many rM2-specific patches and an OpenEmbedded rootfs), recovering its boot process, enabling a download mechanism and serial console, and the steps to upstream vendor kernel patches into mainline.

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