Marvell: update SD8897 firmware to 15.68.4.p42

Release is made on top of P32 with below 3 changes.
- Fix for A2DP stall during long playback.
- Fix for S2R stuck issue related to missed event to host
- Fix for A2DP stall during suspend&resume

BUG= chrome-os-partner:26770, chrome-os-partner:26511,
     chrome-os-partner:26916

     TEST= 1) Install on peach-pit/pi, check dmesg for fw versioin
           2) run suspend_stress_test --suspend_max 15
              --suspend_min 10 --wake_max 15 --wake_min 10
           3) WiFi+BT: Audio streamming long run test and
              colse rid test over >2 hours.

Change-Id: I00c0c78c59bd5aaac5a1a31c373f075fd1f865a8
(cherry picked from commit 7d4456ee0a5c1f0cf2e27da8cce6ae5765aab952)
Reviewed-on: https://chromium-review.googlesource.com/192449
Reviewed-by: hyuckjoo lee <hyuckjoolee345@gmail.com>
Commit-Queue: hyuckjoo lee <hyuckjoolee345@gmail.com>
Tested-by: hyuckjoo lee <hyuckjoolee345@gmail.com>
Reviewed-by: mukesh agrawal <quiche@chromium.org>
(cherry picked from commit cb4cec2fb2b2d7df92cf9ddcf8fb0d3dad2eca6f)
Reviewed-on: https://chromium-review.googlesource.com/193694
Reviewed-by: Jongpil Jung <jongpil19.jung@samsung.com>
Tested-by: Jongpil Jung <jongpil19.jung@samsung.com>
Reviewed-by: Katie Roberts-Hoffman <katierh@chromium.org>
Commit-Queue: Jongpil Jung <jongpil19.jung@samsung.com>
1 file changed