Merge remote-tracking branch 'riscv/riscv-wx-mappings' into fixes

Merge remote-tracking branch 'riscv/riscv-wx-mappings' into fixes

This single commit is shared between fixes and for-next, as it fixes a
concrete bug while likely conflicting with a more invasive cleanup to
avoid these oddball mappings entirely.

* riscv/riscv-wx-mappings:
  riscv: mm: Fix W+X mappings at boot