Wifi usability: Add firmware alert reason code into WifiUsabilityStats

Firmware alert can trigger Wifi usability stats data collection.
Currently the reason code of firmware alert is not collected as an
attribute.  Populate the reason code when collecting Wifi usability
stats.

Bug: 129426122
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh

Change-Id: I990496ac25b47e6d7fc75e6a383ed4988d9c3ef1
Signed-off-by: Mingguang Xu <mingguangxu@google.com>
4 files changed