Do not install libraries with devel packages. (#7776)

Do not install libraries with devel packages. (#7776)

Do not install duplicated libraries with devel packages; it incur build errors in applications with indirect dependencies on nnfw.
For example, if A Requires B and B BuildRequires nnfw, building A indirect-BuildRequires nnfw's *.so files, which cannot be resolved by GBS or OBS because both nnfw and nnfw-devel have nnfw's *.so files.
Thus, if nnfw has all *.so files in _libdir, do not install them with devel except for representative symlinks.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>