x86: nge Driver Updated to Support Jumbo Framework

This networking enhancement is new in the Developer 5/07 release.

Starting with this release, the nge driver has been updated to enable Jumbo Frame support. The nge driver's default MTU has been raised to 9 Kbytes, that improves system performance and lowers CPU utilization significantly.

For more information, see the nge(7D) man page.