Kernel: Rewrite whole device structure

We now have DevFileSystem which is derived from RamFileSystem. All
devices are RamInodes. We don't have separate DeviceManager anymore.
To iterate over devices, you can loop througn every inode in devfs.

kernel/include/kernel/Terminal/TTY.h

@@ -113,11 +113,9 @@ namespace Kernel
 		virtual uid_t uid() const override { return 0; }
 		virtual gid_t gid() const override { return 0; }
 		virtual dev_t rdev() const override { return m_rdev; }
-		virtual BAN::StringView name() const { return m_name; }
 
 	private:
 		dev_t m_rdev;
-		BAN::String m_name;
 	};
 
 }