s390/module: Use s390_kernel_write() for late relocations

Because of late module patching, a livepatch module needs to be able to
apply some of its relocations well after it has been loaded.  Instead of
playing games with module_{dis,en}able_ro(), use existing text poking
mechanisms to apply relocations after module loading.

So far only x86, s390 and Power have HAVE_LIVEPATCH but only the first
two also have STRICT_MODULE_RWX.

This will allow removal of the last module_disable_ro() usage in
livepatch.  The ultimate goal is to completely disallow making
executable mappings writable.

[ jpoimboe: Split up patches.  Use mod state to determine whether
	    memcpy() can be used.  Test and add fixes. ]

Cc: [email protected]
Cc: Heiko Carstens <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Suggested-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Joe Lawrence <[email protected]>
Acked-by: Miroslav Benes <[email protected]>
Acked-by: Gerald Schaefer <[email protected]> # s390
Signed-off-by: Jiri Kosina <[email protected]>

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