MFC:	1.34
MFC:	1.34

- Allow for VLAN-sized frames and set IFCAP_VLAN_MTU.
- On resume all registers have to be initialized again like after
  power-on so reset sc_inited in gem_suspend() in order get all of
  the registers set next time gem_init_regs() is called.
- On at least some ERI and GEM revisions GEM_MAC_RX_OVERFLOW happen
  often due to a silicon bug and re-initializing is all we can do
  about these errors so make handling them non-verbose.
- Remove a superfluous memset(3) call in gem_meminit(), all elements
  are initialized to 0 anyway.

Approved by:	re (scottl)

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