Marvell 8897 firmware version 15.68.4.p82

Update Marvell 8897 firmware to version 15.68.4.p82

Changes since p73
1. Fix for autotest #60 
2. Fix for Lucas II Battery drained
3. Throughput improvements
4. Fix for autotest #54

BUG=chromium:390731
TEST=Run wifi_matfunc test suite for enguarde and peach_pit

Change-Id: I3c913c81a597f71fe966986fd04243a4f98da09a
Reviewed-on: https://chromium-review.googlesource.com/206853
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Peter Qiu <zqiu@chromium.org>
Tested-by: Peter Qiu <zqiu@chromium.org>
2 files changed