ASoC: codecs: jz4725b: Use C++ style comments in header

Change the header comment to use C++ style, so that it looks more
consistent with the rest of ASoC.
Signed-off-by: NPaul Cercueil <paul@crapouillou.net>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/jz4725b.c

 // SPDX-License-Identifier: GPL-2.0
-/*
- * JZ4725B CODEC driver
- *
- * Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
- */
+//
+// JZ4725B CODEC driver
+//
+// Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
 
 #include <linux/kernel.h>
 #include <linux/module.h>