ixgbevf: remove 82599 from the module description

This patch removes 82599 from the description of the ixgbevf module
since the VF driver is supported on other parts as well.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>