C2SoftCodecTests: Add unit tests for c2 soft codecs

plus build fix:

If50bacb libcodec2: Updated to build both static and shared libray
I07fe5a3 libsfplugin_ccodec_utils: Updated to build both static and shared libray
I1217ad4 libcodec2_vndk: Updated to build both static and shared libray
I131d585 Codec2 components: Updated to build both static and shared libray

Bug: 181243220
Test: atest C2SoftMpeg4DecTest
Merged-In: I34b9ab63d3aef867a1a2a59b10befc995f1e34b0
Change-Id: I34b9ab63d3aef867a1a2a59b10befc995f1e34b0