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,

     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-by: hyuckjoo lee <>
Commit-Queue: hyuckjoo lee <>
Tested-by: hyuckjoo lee <>
Reviewed-by: mukesh agrawal <>
1 file changed