When loading a savestate with more ram, realloc.

Also, I'm not sure the extra ram is being handled correctly, I think it's
not meant to be exposed to games except homebrew, not sure of the exact
method...

Core/MemMap.cpp

@@ -136,10 +136,16 @@ void DoState(PointerWrap &p)
 			g_MemorySize = RAM_NORMAL_SIZE;
 		g_PSPModel = PSP_MODEL_FAT;
 	} else {
+		u32 oldMemorySize = g_MemorySize;
 		p.Do(g_PSPModel);
 		p.DoMarker("PSPModel");
-		if (!g_RemasterMode)
+		if (!g_RemasterMode) {
 			g_MemorySize = g_PSPModel == PSP_MODEL_FAT ? RAM_NORMAL_SIZE : RAM_DOUBLE_SIZE;
+			if (oldMemorySize < g_MemorySize) {
+				Shutdown();
+				Init();
+			}
+		}
 	}
 
 	p.DoArray(GetPointer(PSP_GetKernelMemoryBase()), g_MemorySize);