SI: Move MAX_SI_CHANNELS into the SerialInterface namespace

Given this constant is related to the serial interface, it shouldn't be
outside of the namespace.

Source/Core/Core/BootManager.cpp

@@ -61,7 +61,7 @@ public:
   bool bSetEmulationSpeed;
   bool bSetVolume;
   std::array<bool, MAX_BBMOTES> bSetWiimoteSource;
-  std::array<bool, MAX_SI_CHANNELS> bSetPads;
+  std::array<bool, SerialInterface::MAX_SI_CHANNELS> bSetPads;
   std::array<bool, MAX_EXI_CHANNELS> bSetEXIDevice;
 
 private:
@@ -92,7 +92,7 @@ private:
   std::string sBackend;
   std::string m_strGPUDeterminismMode;
   std::array<int, MAX_BBMOTES> iWiimoteSource;
-  std::array<SIDevices, MAX_SI_CHANNELS> Pads;
+  std::array<SIDevices, SerialInterface::MAX_SI_CHANNELS> Pads;
   std::array<TEXIDevices, MAX_EXI_CHANNELS> m_EXIDevice;
 };
 
@@ -180,7 +180,7 @@ void ConfigCache::RestoreConfig(SConfig* config)
     config->m_wii_language = m_wii_language;
   }
 
-  for (unsigned int i = 0; i < MAX_SI_CHANNELS; ++i)
+  for (unsigned int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
   {
     if (bSetPads[i])
       config->m_SIDevice[i] = Pads[i];
@@ -279,7 +279,7 @@ bool BootCore(const std::string& _rFilename)
     core_section->Get("Overclock", &StartUp.m_OCFactor, StartUp.m_OCFactor);
     core_section->Get("OverclockEnable", &StartUp.m_OCEnable, StartUp.m_OCEnable);
 
-    for (unsigned int i = 0; i < MAX_SI_CHANNELS; ++i)
+    for (unsigned int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
     {
       int source;
       controls_section->Get(StringFromFormat("PadType%u", i), &source, -1);

Source/Core/Core/ConfigManager.cpp

@@ -257,7 +257,7 @@ void SConfig::SaveCoreSettings(IniFile& ini)
   core->Set("SlotB", m_EXIDevice[1]);
   core->Set("SerialPort1", m_EXIDevice[2]);
   core->Set("BBA_MAC", m_bba_mac);
-  for (int i = 0; i < MAX_SI_CHANNELS; ++i)
+  for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
   {
     core->Set(StringFromFormat("SIDevice%i", i), m_SIDevice[i]);
     core->Set(StringFromFormat("AdapterRumble%i", i), m_AdapterRumble[i]);
@@ -577,7 +577,7 @@ void SConfig::LoadCoreSettings(IniFile& ini)
   core->Get("BBA_MAC", &m_bba_mac);
   core->Get("TimeProfiling", &bJITILTimeProfiling, false);
   core->Get("OutputIR", &bJITILOutputIR, false);
-  for (int i = 0; i < MAX_SI_CHANNELS; ++i)
+  for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
   {
     core->Get(StringFromFormat("SIDevice%i", i), (u32*)&m_SIDevice[i],
               (i == 0) ? SIDEVICE_GC_CONTROLLER : SIDEVICE_NONE);

Source/Core/Core/HW/SI/SI.h

@@ -15,14 +15,14 @@ namespace MMIO
 class Mapping;
 }
 
+namespace SerialInterface
+{
 // SI number of channels
 enum
 {
   MAX_SI_CHANNELS = 0x04
 };
 
-namespace SerialInterface
-{
 void Init();
 void Shutdown();
 void DoState(PointerWrap& p);

Source/Core/Core/Movie.cpp

@@ -484,14 +484,14 @@ void ChangePads(bool instantly)
 
   int controllers = 0;
 
-  for (int i = 0; i < MAX_SI_CHANNELS; ++i)
+  for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
     if (SIDevice_IsGCController(SConfig::GetInstance().m_SIDevice[i]))
       controllers |= (1 << i);
 
   if (instantly && (s_controllers & 0x0F) == controllers)
     return;
 
-  for (int i = 0; i < MAX_SI_CHANNELS; ++i)
+  for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
   {
     SIDevices device = SIDEVICE_NONE;
     if (IsUsingPad(i))
@@ -563,7 +563,7 @@ bool BeginRecordingInput(int controllers)
 
   s_rerecords = 0;
 
-  for (int i = 0; i < MAX_SI_CHANNELS; ++i)
+  for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
     if (SConfig::GetInstance().m_SIDevice[i] == SIDEVICE_GC_TARUKONGA)
       s_bongos |= (1 << i);