Set block size in dm-bow

Fix block-level checkpointing to work correctly when used in combination with
512 byte hardware sectors and metadata encryption with dm-default-key v2.

Bug: 153512828
Test: Parameter is passed to dm-bow based on first_api_level
Change-Id: Ic0a071221559271db20b06b2f17459b5b041e02d
Merged-In: Ic0a071221559271db20b06b2f17459b5b041e02d
3 files changed