video_core/engines/engine_upload: Default destructor in the cpp file

Avoids inlining destruction logic where applicable, and also makes
forward declarations not cause unexpected compilation errors depending
on where the State class is used.

src/video_core/engines/engine_upload.cpp

@@ -14,6 +14,8 @@ namespace Tegra::Engines::Upload {
 State::State(MemoryManager& memory_manager, Registers& regs)
     : memory_manager(memory_manager), regs(regs) {}
 
+State::~State() = default;
+
 void State::ProcessExec(const bool is_linear) {
     write_offset = 0;
     copy_size = regs.line_length_in * regs.line_count;