btrfs: remove extent_map_tree forward declaration at extent_io.h

There's no need to do a forward declaration of struct extent_map_tree at
extent_io.h, as there are no function prototypes, inline functions or data
structures that refer to struct extent_map_tree.

So remove that forward declaration, which is not needed since commit
477a30ba ("btrfs: Sink extent_tree arguments in
try_release_extent_mapping").

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>