media: atomisp: gate ref and tnr frame config behind ISP enable flags

media: atomisp: gate ref and tnr frame config behind ISP enable flags

The FIXME comment noted that delay_frames can be NULL for certain
pipeline configurations, without knowing why. The reason is that when a
binary does not enable ref_frame, delay frame allocation is
intentionally skipped to save memory, leaving the pointers NULL by
design.

The ISP feature flags in binary->info->sp.enable accurately reflect
which features are active for a given binary. Using enable.ref_frame and
enable.tnr as the predicate for their respective configuration steps
ensures the configuration path stays in sync with what was actually
built into the pipeline

Signed-off-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>