powerpc: use a CONSOLE_LOGLEVEL_DEBUG macro

Use a CONSOLE_LOGLEVEL_DEBUG macro for console_loglevel rather
than a naked number.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/udbg.c

@@ -74,7 +74,7 @@ void __init udbg_early_init(void)
 #endif
 
 #ifdef CONFIG_PPC_EARLY_DEBUG
-	console_loglevel = 10;
+	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
 
 	register_early_udbg_console();
 #endif