Remove USER_DEFINED in IncludePkgHeader in spd files as it does not make sense to...

Remove USER_DEFINED in IncludePkgHeader in spd files as it does not make sense to specify package include header file for a custom build type module. Package creator has no a priori knowledge about what header file will be needed by the USER_DEFINED module customers created in dependent package.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2316 6f19259b-4bc3-4df7-8a09-765794883524