VideoCommon: add constant value to set the allowed maximum number of pixel samplers

Source/Core/VideoCommon/CMakeLists.txt

@@ -23,6 +23,7 @@ add_library(videocommon
   CommandProcessor.cpp
   CommandProcessor.h
   ConstantManager.h
+  Constants.h
   CPMemory.cpp
   CPMemory.h
   CPUCull.cpp

Source/Core/VideoCommon/Constants.h

@@ -0,0 +1,11 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "Common/CommonTypes.h"
+
+namespace VideoCommon
+{
+constexpr u32 MAX_PIXEL_SHADER_SAMPLERS = 8;
+}