btrfs: merge REQ_OP and REQ_ flags to one parameter in submit_extent_page

The function submit_extent_page has 15(!) parameters right now, op and
op_flags are effectively one value stored to bio::bi_opf, no need to
pass them separately. So it's 14 parameters now.

Signed-off-by: David Sterba <dsterba@suse.com>