Build: Refine template files

- Move every member of 'PARTITION_DECLARE' in a new line to make it
  more clear.
- Remove unused more line and partition from 'tfm_service_list.inc'.
- Use partition id value in tfm_partition_defs.inc.

Change-Id: I5e9e429400234d3306eecebb4d1a8ced92dbfe6d
Signed-off-by: Edison Ai <edison.ai@arm.com>