[RTL PMP] Fix address matching bugs
[RTL PMP] Fix address matching bugs

- Partial matching not relevant for 32bit only accesses
- Apply region size masking correctly

lowRISC/ibex,lowRISC/ibex,AmbiML/ibex,lowRISC/ibex,AmbiML/ibex,lowRISC/ibex,AmbiML/ibex,AmbiML/ibex