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>
diff --git a/drivers/media/usb/tm6000/tm6000-usb-isoc.h b/drivers/media/usb/tm6000/tm6000-usb-isoc.h
index e69f5cf..5c615b0 100644
--- a/drivers/media/usb/tm6000/tm6000-usb-isoc.h
+++ b/drivers/media/usb/tm6000/tm6000-usb-isoc.h
@@ -1,7 +1,9 @@
-// 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>