Visualizer: do not use GNU old-style field designators

Avoiding the use of GCC extensions improves code
portability

Change-Id: Iabe9fc84d135160367922e6d026e8608475fe8c8
voice_processing: do not use GNU old-style field designators

Not using a GNU extension improves portability

Change-Id: I732753d2efa19efb48312664c7a2155f78ceee35