powerpc/powernv: Fix section mismatch from opal_lpc_init()

opal_lpc_init() is called from an __init routine, and calls other __init
routines, so should also be __init, init?

Fixes: 023b13a50183 ("powerpc/powernv: Add support for direct mapped LPC on POWER9")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/powernv/opal-lpc.c

@@ -387,7 +387,7 @@ static int opal_lpc_init_debugfs(void)
 machine_device_initcall(powernv, opal_lpc_init_debugfs);
 #endif  /* CONFIG_DEBUG_FS */
 
-void opal_lpc_init(void)
+void __init opal_lpc_init(void)
 {
 	struct device_node *np;