Added GSP_GPU::FlushDataCache

This cannot be finished until Kprocess is implemented, until then it just shows an info log regarding what it called.

src/core/hle/service/gsp.cpp

@@ -149,6 +149,30 @@ void SetBufferSwap(Service::Interface* self) {
     cmd_buff[1] = 0; // No error
 }
 
+/**
+* GSP_GPU::FlushDataCache service function
+*
+* TODO: This will need to be finished in the future when KProcess is implemented.
+*
+* Inputs:
+* 1 : Address
+* 2 : Size
+* 3 : Value zero
+* 4 : KProcess handle 
+* Outputs:
+* 1 : Result of function, 0 on success, otherwise error code
+*/
+void FlushDataCache(Service::Interface* self) {
+    u32* cmd_buff = Service::GetCommandBuffer();
+    u32 addr    = cmd_buff[1];
+    u32 size    = cmd_buff[2];
+    u32 value   = cmd_buff[3];
+    u32 process = cmd_buff[4];
+
+    cmd_buff[1] = 0; // No error
+    INFO_LOG(GSP, "called addr=0x%08X, size=0x%08X, value=0x%08X, process=0x%08X", addr, size, value, process);
+}
+
 /**
  * GSP_GPU::RegisterInterruptRelayQueue service function
  *  Inputs: