Remove incremental sp_layout.json build

The merging of sp_layout.json is moved to the build repository because
it needs control over the order of the JSON fragments. The merge_json.py
remains in trusted-services to help integrations avoid duplicating the
tool.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I3c56d8348a3b45d766dad4c5ecbed42887511f9d
1 file changed