os: add DetachIoRegionHandle

libraries/libstratosphere/include/stratosphere/os/os_io_region_api.hpp

@@ -26,6 +26,7 @@ namespace ams::os {
     Result CreateIoRegion(IoRegionType *io_region, NativeHandle io_pool_handle, uintptr_t address, size_t size, MemoryMapping mapping, MemoryPermission permission);
 
     void AttachIoRegionHandle(IoRegionType *io_region, size_t size, NativeHandle handle, bool managed);
+    os::NativeHandle DetachIoRegionHandle(IoRegionType *io_region);
 
     void DestroyIoRegion(IoRegionType *io_region);
 

libraries/libstratosphere/include/stratosphere/os/os_io_region_types.hpp

@@ -26,6 +26,7 @@ namespace ams::os {
             State_NotInitialized = 0,
             State_Initialized    = 1,
             State_Mapped         = 2,
+            State_Detached       = 3,
         };
 
         NativeHandle handle;