Remove cache miss test from all but one AMO test

Remove cache miss test from all but one AMO test

This doesn't reduce coverage for cache-based RV64 systems, but will
improve test runtime and work around the need for smaller test footprint
for scratchpad-based RV32 systems.

I would argue that these microarchitectural tests should be in the
domain of torture, and that the last one should be removed, too.