Add unit constants

There are lots of numeric expressions across some projects, such as
1024*1024 , 1024**3, 1000, 1000000 etc. This patch adds binary and
decimal unit constants and will sync into other projects. Replacing
nummeric experssions with these constants makes code more readable.

blueprint byte-unit-clean

Change-Id: I5093244f607d8c3a61a5f6b7ecbe657e5574b793
Merge "Add unit constants"