WiFi HAL: add packet fate monitoring API

WiFi HAL: add packet fate monitoring API

When a connection attempt fails, we're often unable
to determine the cause from existing log files. This
is because our log files only report the view from user
space. From this vantage point, we can't tell if,
e.g., an outbound frame was ever sent over the air.
(Or, for inbound frames: if they were heard by our
radio.)

To give ourselves a broader view, we add the packet fate
monitoring API. This API will let us determine, e.g.,
if an outbound frame was transmitted by our radio.

BUG: 26807558
Change-Id: I197729117f9086ece8cf00313bb9d3e7c0197b97