refactor(smc_fuzzing): add new test function

Adding the new runtestfunction for easier user introduction
of SMC calls and also creating a new top level device tree file
to encapsulate all SMC calls in one structure.  This includes
only SDEI calls currently.

Signed-off-by: mardyk01 <mark.dykes@arm.com>
Change-Id: I4295de564a1114706aa43c373abb7578c68b7cfa
4 files changed