Kernel: DeviceManager is now a 'FileSystem' so it can expose devices

Shell reads keyboard through /dev/input :)

kernel/include/kernel/FS/Inode.h

@@ -35,6 +35,8 @@ namespace Kernel
 
 		enum class Type
 		{
+			DeviceManager,
+			Device,
 			Ext2,
 		};
 

kernel/include/kernel/FS/VirtualFileSystem.h

@@ -19,6 +19,7 @@ namespace Kernel
 		virtual BAN::RefPtr<Inode> root_inode() override  { return m_root_inode; }
 
 		BAN::ErrorOr<void> mount_test();
+		BAN::ErrorOr<void> mount(FileSystem*, BAN::StringView);
 
 		struct File
 		{