module: Use set_memory_rox()

A couple of architectures seem concerned about calling set_memory_ro()
and set_memory_x() too frequently and have implemented a version of
set_memory_rox(), see commit 60463628 ("x86/mm: Implement native
set_memory_rox()") and commit 22e99fa5 ("s390/mm: implement
set_memory_rox()")

Use set_memory_rox() in modules when STRICT_MODULES_RWX is set.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>