media: atomisp: ov2680: Use defines for fps, lines-per-frame and skip-frames

The fps, lines-per-frame and skip-frames values are the same for all
resolutions, use defines for these.

The ov2680_res_preview[] incorrectly sets fps to 60 for some low-res
modes, this is incorrect with the current fixed (resolution independent)
lines-per-frame value.

Note this not drop the now no longer used fps, lines-per-frame and
skip-frames struct ov2680_resolution members. The entire struct is going
away in the next patches so that would just cause unnecessary changes.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>