Build: Enable linking with PSA API compliance tests in the NS app

This change modifies the build system to support linking
the PSA API compliance test static libraries. It introduces
a new build configuration ConfigPsaApiTest.cmake for this purpose.
The build instructions are updated to show an example of how
to use this new build configuration.

Change-Id: Iabf4876504e690826fe80b467a91fa53bffb0b47
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Co-Authored-by: Antonio de Angelis <antonio.deangelis@arm.com>
12 files changed