media: atomisp: Replace last use of Intel MID APIs

Intel MID special header is not in use in this driver.
Replace it with a better macro for now on.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>