powerpc/xive: Do not expose a debugfs file when XIVE is disabled

The XIVE interrupt mode can be disabled with the "xive=off" kernel
parameter, in which case there is nothing to present to the user in the
associated /sys/kernel/debug/powerpc/xive file.

Fixes: 930914b7 ("powerpc/xive: Add a debugfs file to dump internal XIVE state")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200429075122.1216388-4-clg@kaod.org

arch/powerpc/sysdev/xive/common.c

@@ -1664,6 +1664,7 @@ DEFINE_SHOW_ATTRIBUTE(xive_core_debug);
 
 int xive_core_debug_init(void)
 {
+	if (xive_enabled())
 		debugfs_create_file("xive", 0400, powerpc_debugfs_root,
 				    NULL, &xive_core_debug_fops);
 	return 0;