Merge patch series "riscv: some CMO alternative related clean up"

These cleanups came up as part of the discussion on the "riscv: Reduce
ARCH_KMALLOC_MINALIGN to 8" patch set, but that needs additional work
and thus will be delayed at least a cycle.

* b4-shazam-merge:
  riscv: mm: mark noncoherent_supported as __ro_after_init
  riscv: mm: mark CBO relate initialization funcs as __init
  riscv: errata: thead: only set cbom size & noncoherent during boot

Link: https://lore.kernel.org/linux-riscv/[email protected]/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>