Remove free data section when the module exits

Remove free data section when the module exits

In the hal backend module, when the moudle exits, the hal_backend_[module]_funcs was
handled from [module]_exit function.
The data parameter is handed over from hal-api-common put_backend function.
And data is pointing to hal_backend_[module]_funcs, and free by hal-backend module.
As memory release operation moves to the hal-api-device side,
also double free operation is useless, thus it is deleted from hal-backend.

Change-Id: I43d1043df40cad6ddf97569f13ede1f2b2afd184
Signed-off-by: Yunhee Seo <yuni.seo@samsung.com>