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>
4 files changed