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>
diff --git a/src/meson.build b/src/meson.build
index 698258a..d183f6d 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -7,7 +7,7 @@
 so_version = '0.1.0'
 
 sources = [
-  'iei_oem.cpp',
+  'asset_info.cpp',
 ]
 
 deps = [