Bluetooth: btmrvl_main: repair a non-kernel-doc comment

Do not use "/**" to begin a non-kernel-doc comment.
Fixes this build warning:

drivers/bluetooth/btmrvl_main.c:2: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc: linux-bluetooth@vger.kernel.org
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Author: rddunlap

drivers/bluetooth/btmrvl_main.c

@@ -1,4 +1,4 @@
-/**
+/*
  * Marvell Bluetooth driver
  *
  * Copyright (C) 2009, Marvell International Ltd.