fix: ggml-vulkan logs

[thewh1teagle]

Currently vulkan always prints to stderr the device name.
Fix by print it using ggml log.

Also register ggml log immediately when whisper_log_set otherwise there's still some logs that displays before (tested with main.cpp)

cmake -G "Ninja" -B build . -DCMAKE_BUILD_TYPE=Release -DGGML_VULKAN=ON
cmake --build build --config Release

.\build\bin\main.exe -m model.bin -f audio.wav
.\build\bin\main.exe -m model.bin -f audio.wav --no-prints