Miscellaneous DSi NAND fixes (#1852)

* Replace some standard I/O calls with Platform equivalents

- I missed a spot when I submitted that PR a few months ago

* Include <memory> in DSi_NAND.h

- Because it uses unique_ptr

* Split DSi_NAND::ReadHardwareInfo into ReadSerialData and ReadHardwareInfoN

* Add a RegionMask enum

* Move DSi NAND patching to the frontend

* Add DSiSupportedLanguageMask

- Not currently used by the frontend, but I use it in melonDS DS

* Remove some Platform::ConfigEntry values

- The core no longer needs to know about them
- The corresponding Config values are unchanged

* Mark NANDMount's destructor as noexcept

src/DSi.cpp

@@ -540,8 +540,9 @@ void SetupDirectBoot()
                     ARM9Write32(0x02000400+i, *(u32*)&userdata.Bytes[0x88+i]);
 
                 DSi_NAND::DSiSerialData hwinfoS {};
+                nand.ReadSerialData(hwinfoS);
                 DSi_NAND::DSiHardwareInfoN hwinfoN;
-                nand.ReadHardwareInfo(hwinfoS, hwinfoN);
+                nand.ReadHardwareInfoN(hwinfoN);
 
                 for (u32 i = 0; i < 0x14; i+=4)
                     ARM9Write32(0x02000600+i, *(u32*)&hwinfoN[0x88+i]);
@@ -944,7 +945,7 @@ bool LoadNAND()
         NDS::ARM7->JumpTo(bootparams[6]);
     }
 
-    nandmount.PatchUserData();
+    // user data is now expected to be patched by the frontend
 
     return true;
 }