powerpc/pseries: Log hcall return codes for PLPKS debug

The plpks code converts hypervisor return codes into their Linux
equivalents so that users can understand them.  Having access to the
original return codes is really useful for debugging, so add a
pr_debug() so we don't lose information from the conversion.
Signed-off-by: NRussell Currey <ruscur@russell.cc>
Signed-off-by: NAndrew Donnellan <ajd@linux.ibm.com>
Reviewed-by: NStefan Berger <stefanb@linux.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230210080401.345462-19-ajd@linux.ibm.com

arch/powerpc/platforms/pseries/plpks.c

@@ -117,6 +117,8 @@ static int pseries_status_to_err(int rc)
 		err = -EINVAL;
 	}
 
+	pr_debug("Converted hypervisor code %d to Linux %d\n", rc, err);
+
 	return err;
 }