Add necessary files (such as *.h) in module msa and remove unused msa files.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@882 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Core/Pei/PeiMain.msa

@@ -64,6 +64,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.-->
   <SourceFiles>
     <Filename>PeiMain.h</Filename>
     <Filename>BootMode/BootMode.c</Filename>
+    <Filename>Dependency/dependency.h</Filename>
     <Filename>Dependency/dependency.c</Filename>
     <Filename>Dispatcher/Dispatcher.c</Filename>
     <Filename>FwVol/FwVol.c</Filename>