media: fix kernel-doc markups

Some identifiers have different names between their prototypes
and the kernel-doc markup. Seome seems to be due to cut-and-paste
related issues.

Others need to be fixed, as kernel-doc markups should use this format:
        identifier - description

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> # IPU3 and V4L2
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>