BpfMap.h: introduce BpfMapRW

which allows writes, but not deletes.

This is technically what bpf map arrays are capable of.

Test: TreeHugger
Flag: EXEMPT mainline
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1f73bea5428c190af17442539c296282ce9e0786
9 files changed