lib/debugfs: Function to read debugfs with the directory already open

tests/kms_frontbuffer_tracking and tests/kms_psr read debugfs nodes
several times after opening the directory once. There is already an
implementation of this in the kms_frontbuffer_tracking, moving that
functionality to the library will allow us to share the code with kms_psr
and kms_fbcon_fbt

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>

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