migration/multifd: Introduce MultiFDSendData

migration/multifd: Introduce MultiFDSendData

Add a new data structure to replace p->pages in the multifd
channel. This new structure will hide the multifd payload type behind
an union, so we don't need to add a new field to the channel each time
we want to handle a different data type.

This also allow us to keep multifd_send_pages() as is, without needing
to complicate the pointer switching.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>