DVB, header files, and user-space regressions

A regression that was recently reported for 5.14 in the media subsystem is a bit of a strange beast. The kernel's user-space binary interface (ABI) was not changed, which is the usual test for a patch to get reverted, but the report still led to a reversion. The change did lead to problems building a user-space application because it moved some header files to staging/ as part of a cleanup for a deprecated—though apparently still functioning—driver for a Digital Video Broadcasting (DVB) device. There are a few different issues tangled together here, but the reversion of a regression in the user-space API (and not ABI) is a new wrinkle.

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