drivers: media: platform: Kconfig: Add Video decoder kconfig entries

commit d4ec201d6606f5dddd862cb5cf14b109968090da from
TI Linux SDK PROCESSOR-SDK-LINUX-J721E_07.03.00.05

Add video decoder basic config to Kconfig and
select the required V4l2 modules.

Signed-off-by: Angela Stegmaier <angelabaker@ti.com>
Signed-off-by: Sunita Nadampalli <sunitan@ti.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>

Modified help syntax from --help-- to help

Signed-off-by: Sidraya Jayagond <sidraya.bj@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>