ci(n1sdp): add PSCI runtime instrumentation tests

Add fragments to enable building FIP images with TFTF on N1SDP. There's
no support for this at the moment. With this in place, add fragments and
a test configuration to enable the "Runtime Instrumentation" test suite
to be run.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: I43afb806777de6e128ebe9686708c78cce26673a
6 files changed