v5: require there to be space for APFv6 reserved counters

APFv6 reserved counters:
  1 counter endianness information (stores 0x12345678)
  2 total packets (will be incremented by data jmp)
  3 allocation failure
  4 transmit failure

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I93c205af700e113bb4f6a89da5c1638cbe26bd9f
2 files changed