APFv6.1: allow [e]PKTDATACOPY to copy up to 511 bytes

Before:
   text    data     bss     dec     hex filename
   3128       0       0    3128     c38 apf_interpreter.armt.o
   4777       0       0    4777    12a9 apf_interpreter.arm.o
   4856       0       0    4856    12f8 apf_interpreter.aarch64.o
   6098       0       0    6098    17d2 apf_interpreter.x86.o
   5914       0       0    5914    171a apf_interpreter.x86-64.o
After:
   text    data     bss     dec     hex filename
   3144       0       0    3144     c48 apf_interpreter.armt.o
   4797       0       0    4797    12bd apf_interpreter.arm.o
   4876       0       0    4876    130c apf_interpreter.aarch64.o
   6118       0       0    6118    17e6 apf_interpreter.x86.o
   5940       0       0    5940    1734 apf_interpreter.x86-64.o

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Iaf91278dd1f0a79beb3d6327d6ecd7c075d8a1af
4 files changed