db845c: Set the flash block size to 4096 am: 2a5ca1a30f am: b2be74f5cd am: 21020703c2 am: a2432d4328

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2164963

Change-Id: I477b48be39bd2999cd84ae23701fe7e40a29d336
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>