[host1x] fix ffmpeg not having va-api on freebsd, inline nvenc (#3878)

- fix va-api not being used on freebsd

small thingies dont affect a lot:
- removes some pointer indirection (why save pointer to GMMU if its accesible via host1x)
- use std::variant<> for decoder
- miscelly vp9/v8/h264 opts
Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3878
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/video_core/host1x/codecs/decoder.h

@@ -14,7 +14,7 @@
 #include <queue>
 
 #include "common/common_types.h"
-#include "video_core/host1x/ffmpeg/ffmpeg.h"
+#include "video_core/host1x/ffmpeg.h"
 #include "video_core/host1x/nvdec_common.h"
 
 namespace Tegra {
@@ -35,33 +35,23 @@ public:
         return decode_api.UsingDecodeOrder();
     }
 
-    /// Returns the value of current_codec
-    [[nodiscard]] Host1x::NvdecCommon::VideoCodec GetCurrentCodec() const {
-        return codec;
-    }
-
     /// Return name of the current codec
     [[nodiscard]] virtual std::string_view GetCurrentCodecName() const = 0;
 
 protected:
-    explicit Decoder(Host1x::Host1x& host1x, s32 id,
-                     const Host1x::NvdecCommon::NvdecRegisters& regs,
-                     Host1x::FrameQueue& frame_queue);
+    explicit Decoder(Host1x::Host1x& host1x, s32 id, const Host1x::NvdecCommon::NvdecRegisters& regs);
 
     virtual std::span<const u8> ComposeFrame() = 0;
     virtual std::tuple<u64, u64> GetProgressiveOffsets() = 0;
     virtual std::tuple<u64, u64, u64, u64> GetInterlacedOffsets() = 0;
     virtual bool IsInterlaced() = 0;
 
+    FFmpeg::DecodeApi decode_api;
     Host1x::Host1x& host1x;
-    Tegra::MemoryManager& memory_manager;
     const Host1x::NvdecCommon::NvdecRegisters& regs;
     s32 id;
-    Host1x::FrameQueue& frame_queue;
-    Host1x::NvdecCommon::VideoCodec codec;
-    FFmpeg::DecodeApi decode_api;
-    bool initialized{};
-    bool vp9_hidden_frame{};
+    bool initialized : 1 = false;
+    bool vp9_hidden_frame : 1 = false;
 };
 
 } // namespace Tegra