Marvell: update SD8897 firmware to 15.68.4.p22

Update SD8897 uapsta firmware to version 15.28.4.p22 from Marvell.
This firmware fixed the over tx power issue and improved for some stable
issues.

BUG= chrome-os-partner:26904
TEST= Install on peach-pit/pi, check dmesg for fw versioin
      suspend_stress_test for > 1000 cycles

Change-Id: Ibaa2ed7cab4a0f6e64634776844107d963b1a9d6
(cherry picked from commit 43ff810dad0ded69a9a697eb39bbfcc5a31d64e7)
Reviewed-on: https://chromium-review.googlesource.com/190407
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
1 file changed