adding secure-only SW model

[jkrech]

No description provided.

[ReinhardKeil]

I suggest to hold back with this modification. Devices that have TrustZone can all execute a secure-only project. IMHO this is only relevant for the CMSIS-Toolbox, but not for the PDSC specification.

[jkrech]

Dsecure is only used in conditions and allows to select different components / files within a component based on the selection of the software model of the project.
It does not describe a capability/feature of a processor/device.

[jkrech]

This PR is parked until we have evidence that component/file filtering based on Dsecure="Secure-only" is required or whether using component variants specified in dedicated template projects solves this sufficiently.

[VGRSTM]

This PR is parked until we have evidence that component/file filtering based on Dsecure="Secure-only" is required or whether using component variants specified in dedicated template projects solves this sufficiently.

I guess at least it may have an impact on linker files ... I consider this like enough to unpark.

[jeromecoutant]

This has impact in all etc/XXX.cmake files

[brondani]

LGTM