virnetdevvportprofile: Drop explicit enum virNetDevVPortProfile declaration

virnetdevvportprofile: Drop explicit enum virNetDevVPortProfile declaration

The virNetDevVPortProfile enum is both explicitly declared and
also typedef-ed. This repetition is redundant. Just use typedef.
To make matters worse, there's another type with the same name,
but because in the code, those few places used 'enum
virNetDevVPortProfile var;' to declare variables compilers didn't
complain.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>