In order to modularize software libraries and platform drivers,
we create makefile helpers to treat a folder as a basic compile
unit.
Each module has a build rule (rules.mk) to describe driver and software
library source codes to be built in.
Signed-off-by: Leon Chen <leon.chen@mediatek.com>
Change-Id: Ib2113b259dc97937b7295b265509025b43b14077
Leon Chen