Allow disabling certain PMP modes #808
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Add two new generics to disable certain PMP modes (to reduce CPU size / impact on critical path):
PMP_TOR_MODE_EN(boolean, default true): implement top-of-region (TOP) mode when truePMP_NAP_MODE_EN(boolean, default true): implement naturally-aligned-power-of-2 modes (NA4 and NAPOT) modes when true