Some changes

[SakataGintokiYT]

cellSysutilAvc2: Use UNIMPLEMENTED_FUNC macro instead of fmt::throw_exception.

[NPJB90576]
E {PPU[0x1000000] Thread (main_thread) [0x002dfd80]} cellSysutilAvc2: Unknown media type 0x0
E {PPU[0x1000000] Thread (main_thread) [0x002dfd20]} PPU: 'cellSysutilAvc2EstimateMemoryContainerSize' aborted
F {PPU[0x1000000] Thread (main_thread) [0x002dfd20]} class std::runtime_error thrown: Unimplemented
(in file C:\rpcs3\rpcs3\Emu\Cell\Modules\cellSysutilAvc2.cpp:92)

[BLAS50770]
E {PPU[0x1000000] Thread (main_thread) [0x00a09a68]} PPU: 'cellSysutilAvc2GetVoiceMuting' aborted
F {PPU[0x1000000] Thread (main_thread) [0x00a09a68]} class std::runtime_error thrown: Unimplemented
(in file C:\rpcs3\rpcs3\Emu\Cell\Modules\cellSysutilAvc2.cpp:307)

[mention-bot]

@SakataGintokiYT, thanks for your PR! By analyzing the history of the files in this pull request, we identified @Nekotekina to be a potential reviewer.