[pmp] Improve formatting of PMP addresses for debug
[pmp] Improve formatting of PMP addresses for debug

Signed-off-by: Marno van der Maas <580d44e9051f21f57464b1cc2f7670f31c81fe23@lowrisc.org>

google/riscv-dv,google/riscv-dv,google/riscv-dv