btrfs: use clear_extent_bits() instead of clear_extent_bit() where possible

btrfs: use clear_extent_bits() instead of clear_extent_bit() where possible

Several places are using clear_extent_bit() and passing a NULL value for
the 'cached' argument, which is pointless as they can use instead
clear_extent_bits().

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>