drm/format-helper: Share implementation among conversion helpers
Provide format-independent conversion helpers for system and I/O memory. Implement most existing helpers on top of it. The source and destination formats of each conversion is handled by a per-line helper that is given to the generic implementation. v2: * remove a blank line Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220427141409.22842-5-tzimmermann@suse.de
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