n1: Write bootloader to update splash logo

Change-Id: I1999d93911b7fc1882683b663cd3d757719b14e0
n1: Update camera wrapper to use newer slow shutter parameter

Change-Id: If5259ec26ef8430a15aa220ec5162fc4c64f774e
n1: Add SHA1 hash to filesmap

* New releasetools relies on SHA1 hash to prevent flashing partitions
  when unnecessary.

Change-Id: I3c75722d1043d11ca5ea3b5a4a5241e7b1989c6e