powerpc: Use str_on_off() helper in check_cache_coherency()
Remove hard-coded strings by using the str_on_off() helper function.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241220191705.1446-2-thorsten.blum@linux.dev
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