Implement Cache API for M7 through both User/Privileged Paths

[emrainey]

Add DataCache and InstructionCache Interfaces which when implemented take either the SVC path or direct to supervisor calls.

if constexpr (not run_in_privileged_mode_only) {
    // call supervisor svc<X>
} else {
    // manipulate the hardware directly
}

Then in SVC

switch(imm) {
    case X:
        // manipulate hardware directly
        break;
}

The existing API in the cortex layer is can and should be updated as well to a better interface to be similar to jarnax

[emrainey]

I've implemented this on the develop branch but I need to test all the calls on platform.