drm: add debugfs support on per client-id basis

add support to add a directory for each client-id
with root at the dri level. Since the clients are
unique and not just related to one single drm device,
so it makes more sense to add all the client based
nodes with root as dri.

Also create a debugfs file which show the process
information for the client and create a symlink back
to the parent drm device from each client.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20250704075548.1549849-3-sunil.khatri@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>

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