riscv: Fix PTDUMP output now BPF region moved back to module region

BPF region was moved back to the region below the kernel at the end of
the module region by 3a02764c ("riscv: Ensure BPF_JIT_REGION_START
aligned with PMD size"), so reflect this change in kernel page table
output.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Fixes: 3a02764c ("riscv: Ensure BPF_JIT_REGION_START aligned with PMD size")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>