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

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

Change-Id: I796df43ece75d1c7e88478083cdd2988e1deaba5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>