test(spm): clear memory flag with two constituents

Add another constituent to the test using the clear memory flags
on retrieve request.
This is relevant as there was a bug in the SPM implemention
that was not clearing correctly multiple constituents in a fragment.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I17cf3f32b111771ca913e84e3e10e5b6f669933e
1 file changed