media: fix SPDX comment on some header files

The agreed format is to use /* */ comments inside header
files. Unfortunately, I ended by using // on a few ones.
Reported-by: Andi Shyti <andi.shyti@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/rc/rc-core-priv.h

-// SPDX-License-Identifier: GPL-2.0
-// Remote Controller core raw events header
-//
-// Copyright (C) 2010 by Mauro Carvalho Chehab
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Remote Controller core raw events header
+ *
+ * Copyright (C) 2010 by Mauro Carvalho Chehab
+ */
 
 #ifndef _RC_CORE_PRIV
 #define _RC_CORE_PRIV

drivers/media/usb/tm6000/tm6000-regs.h

-// SPDX-License-Identifier: GPL-2.0
-// tm6000-regs.h - driver for TM5600/TM6000/TM6010 USB video capture devices
-//
-// Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * tm6000-regs.h - driver for TM5600/TM6000/TM6010 USB video capture devices
+ *
+ * Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+ */
 
 /*
  * Define TV Master TM5600/TM6000/TM6010 Request codes

drivers/media/usb/tm6000/tm6000-usb-isoc.h

-// SPDX-License-Identifier: GPL-2.0
-// tm6000-buf.c - driver for TM5600/TM6000/TM6010 USB video capture devices
-//
-// Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * tm6000-buf.c - driver for TM5600/TM6000/TM6010 USB video capture devices
+ *
+ * Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+ */
 
 #include <linux/videodev2.h>
 

drivers/media/usb/tm6000/tm6000.h

-// SPDX-License-Identifier: GPL-2.0
-// tm6000.h - driver for TM5600/TM6000/TM6010 USB video capture devices
-//
-// Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
-//
-// Copyright (c) 2007 Michel Ludwig <michel.ludwig@gmail.com>
-//	- DVB-T support
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * tm6000.h - driver for TM5600/TM6000/TM6010 USB video capture devices
+ *
+ * Copyright (c) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+ *
+ * Copyright (c) 2007 Michel Ludwig <michel.ludwig@gmail.com>
+ *	- DVB-T support
+ */
 
 #include <linux/videodev2.h>
 #include <media/v4l2-common.h>