Build: Generate manifest file name header file

According to PSA FF, the 'manifestfilename.h' need be created by tools:
- Add generate_manifestfilename() function to generate this header file.
- The template file is put in 'secure_fw/services'.
- The related header files of secure partition and test partition are
  created by tools.

Change-Id: Ic53ad481860fea018f29b7eca5a9548d074c19ae
Signed-off-by: Edison Ai <edison.ai@arm.com>