MFC r258941:

Apply vendor improvements to oce(4) driver:

 - Add support to 40Gbps devices;
 - Add support to control adaptive interrupt coalescing (AIC)
   via sysctl;
 - Improve support of BE3 devices;

Many thanks to Emulex for their continued support of FreeBSD.

Submitted by:	Venkata Duvvuru <VenkatKumar.Duvvuru Emulex Com>
Approved by:	re (rodrigc)
MFC r258948:

Support Hyper-V on i386:

 - Add 'hyperv' module into build;
 - Allow building Hyper-V support as part of the kernel;
 - Hook Hyper-V build into NOTES.

Approved by:	re (rodrigc)