[nvdec, android] proper detection and support for GPU decoder (#4068)

Detects Android MediaCodec FFmpeg decoders for H.264/VP8/VP9 when NVDEC GPU decoding is selected.
Required proper support of ffmpeg extradata, h264 frame dimensions and decoder frame handling.
Reenabled (uncommented) NVDEC Emulation selector on Android interface.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4068

src/video_core/host1x/nvdec.cpp

@@ -31,6 +31,7 @@ Nvdec::Nvdec(Host1x& host1x_, s32 id_, u32 syncpt)
 
 Nvdec::~Nvdec() {
     LOG_INFO(HW_GPU, "Destroying nvdec {}", id);
+    host1x.frame_queue.Close(id);
 }
 
 void Nvdec::ProcessMethod(u32 method, u32 argument) {