v4: copy apf.h to v4/apf.h

v4/apf_interpreter.c includes it...

git log apf.h:
  17c1fbc apf: Tweak the interpreter data addressing scheme
  7541097 Add APF opcodes to read/write data memory (take 2)
  dee75a7 Revert "Add APF opcodes to read and write data memory."
  6921f74 Add APF opcodes to read and write data memory.
  497d4ee Add APF disassembler for testing purposes.

last changed by:
  Author: Bernie Innocenti <codewiz@google.com>
on
  Date:   Tue Apr 10 22:52:30 2018 +0900

Test: N/A
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I3fcf1c7b848bcae393484de2a9676b74fdbc8e5e
1 file changed