mv_machine_learning: code clean to setModelInfo function

mv_machine_learning: code clean to setModelInfo function

[Issue type] : code cleanup

Clean up setModelInfo function by doing function extraction.

setModelInfo function converted a given model name to its corresponding
task type internally so it made the function to be complicated.
This patch extracts the conversion portion from setModelInfo function as
another function and makes the function to be called instead.

Change-Id: I93243ffba543f9c6e9a1f0d7690d8f48a1bd14e1
Signed-off-by: Inki Dae <inki.dae@samsung.com>