Name cpp files with functions

Instead of implementing all the features in one cpp file, we organize
the cpp file according to the specific functionality. Here, we renamed
iei_oem.cpp to asset_info.cpp, and in fact this file only implements the
features related to asset information

Change-Id: I29d29dd40fb6eb353e77fbf8eb7370bf0b84ccb6
Signed-off-by: John Wang <wangzhiqiang02@ieisystem.com>
4 files changed