Add platform specific entry for gpuprocess for playstation port. We use the unix entry file which will not launch the GPU process.
PR: https://github.com/WebKit/WebKit/pull/5042
<rdar://problem/101034168>
Committed 255646@main (889de7a84fac): <https://commits.webkit.org/255646@main> Reviewed commits have been landed. Closing PR #5452 and removing active labels.