general cleanups mostly aimed at improving portability of drivers
general cleanups mostly aimed at improving portability of drivers

o ETHER_* (ETHER_ALIGN, ETHER_MAX_FRAME, ETHER_CRC_LEN, etc.)
o M_HASFCS for drivers to indicate packets include FCS
o remove global declarations for ng_ether* and vlan_* since these
  represent a private contract between the if_ethersubr.c code and
  certain parts of the system that should not normally be abused
o add ether_* declarations that were elsewhere
o remove ETHER_BPF_* since they are no longer used with the parameter
  no longer passed to ether_ifattach and ether_ifdetach

Reviewed by:	many
Approved by:	re

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase