media: amphion: cleanup media device if register it fail

there is issue that driver forget to
call media_device_cleanup if media_device_register fail,
it will led to memory leak.
Also driver should check the return value of vpu_add_func.

Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>