db845c: Set baud rate for serial console am: c2840b75d1 am: b213d30154 am: af01fd4e11

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2261884

Change-Id: Iac29d8237fa1426d0e94401b38fb1bdab9e74af8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>