replace wp_get_attachment_image with my own function

How can I replace wp_get_attachment_image() function without changing the core files. The function doesnt have an action hook or a filter hook.

What I am trying to achieve:

for lazyload plugin output the image html like this:

<img width="150" height="150" data-src="https://localhost/yxz/wp-content/uploads/2010/06/calliope.slide_-150x150.jpg" class="attachment-thumbnail" alt="calliope.slide" src="https://localhost/yxz/wp-content/uploads/blank.png">

instead of this:

<img width="150" height="150" src="https://localhost/yxz/wp-content/uploads/2010/06/calliope.slide_-150x150.jpg" class="attachment-thumbnail" alt="calliope.slide">

There is a filter, wp_get_attachment_image_attributes, for the image attributes– a well designed one too.

function alter_att_attributes_wpse_102079($attr) {
  $attr['data-src'] = $attr['src'];
  return $attr;
}
add_filter( 'wp_get_attachment_image_attributes', 'alter_att_attributes_wpse_102079');

That will add the data-src attribute. That looks like what you need. You could add more attributes, or alter the existing onese, if you need.