DIAMETER_Types: Move RFC ddf files earlier in the dependency list of files to generate

A ddf file for TS 29.273 will be added soon to the list, which depends
on several RFCs. Move RFCs earlier in the list since this is a more
generic file than a 3GPP one.

Change-Id: Idcbdfd97332195af05928c81068f6a4779ac306e
2 files changed