net/mlx4: clean up interrupt functions prototypes

net/mlx4: clean up interrupt functions prototypes

The naming scheme for these functions is overly verbose and not accurate
enough, with too many "handler" functions that are difficult to
differentiate (e.g. mlx4_dev_link_status_handler(),
mlx4_dev_interrupt_handler() and priv_dev_status_handler()).

This commit renames them and removes the unnecessary dev argument which can
be retrieved through the private structure where needed. Documentation is
updated accordingly.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>