GPU: Moved SignalInterrupt.

Changed based on empirical evidence. Fixes ZMM and seems fine on other games.

src/core/hw/gpu.cpp

@@ -228,6 +228,7 @@ inline void Write(u32 addr, const T data) {
         {
             u32* buffer = (u32*)Memory::GetPointer(Memory::PhysicalToVirtualAddress(config.GetPhysicalAddress()));
             Pica::CommandProcessor::ProcessCommandList(buffer, config.size);
+            GSP_GPU::SignalInterrupt(GSP_GPU::InterruptId::P3D);
         }
         break;
     }

src/video_core/command_processor.cpp

@@ -46,7 +46,6 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
     switch(id) {
         // Trigger IRQ
         case PICA_REG_INDEX(trigger_irq):
-            GSP_GPU::SignalInterrupt(GSP_GPU::InterruptId::P3D);
             return;
 
         // It seems like these trigger vertex rendering