In contrast to the non-obvious and flexible nature of the optimized bcopy in t1_copy...

In contrast to the non-obvious and flexible nature of the optimized bcopy in t1_copy.S (which
shall retain its CDDL copyright, and thus likely be removed from GENERIC) I have removed the CDDL
from hcall.S because there is zero flexibility in the implementation of hypercalls as they derive
directly from the hypervisor interface which is not copyrighted (ironically the source for the
hypervisor itself is BSD licensed).

It is best to start any bikeshed about this as soon as possible.

Discussed with: bsdimp