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Cleanup unnecessary debugfs dentries and surrounding functions.

v3: remove return value check for debugfs_create_file()
v2: remove ttm_debugfs_entries array.
    do not init variables.
Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>