drm/debugfs: create device-centered debugfs functions

Introduce the ability to track requests for the addition of DRM debugfs
files at any time and have them added all at once during
drm_dev_register().

Drivers can add DRM debugfs files to a device-managed list and, during
drm_dev_register(), all added files will be created at once.

Now, the drivers can use the functions drm_debugfs_add_file() and
drm_debugfs_add_files() to create DRM debugfs files instead of using the
drm_debugfs_create_files() function.

Co-developed-by: Wambui Karuga <[email protected]>
Signed-off-by: Wambui Karuga <[email protected]>
Signed-off-by: Maíra Canal <[email protected]>
Reviewed-by: Maxime Ripard <[email protected]>
Reviewed-by: Melissa Wen <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Signed-off-by: Maíra Canal <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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