powerpc/64s: Disable preemption in hash lazy mmu mode

apply_to_page_range on kernel pages does not disable preemption, which
is a requirement for hash's lazy mmu mode, which keeps track of the
TLBs to flush with a per-cpu array.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221013151647.1857994-1-npiggin@gmail.com