media: atomisp: remove redundant NULL check of "params"

The check result of (!A || (A && B)) is equivalent to (!A || B),
so remove redundant NULL check of "params"

Link: https://lore.kernel.org/linux-media/20201117081058.673291-1-dingxiang@cmss.chinamobile.com


Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>