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Canonicalise broadcom DRMbuf format modifiers

David Turner requested to merge david.turner/wlroots:canonicalise_modifiers into master

When checking if a DMAbuf's format modifiers are compatible with the output, apply canonicalisation to Broadcom modifiers. These modifiers include stripe height as a parameter and the outputs support all parameter values without explicitly listing them.

This enables direct scanout of DMAbufs from the HEVC decoder on Raspberry Pi 4/5.

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