media: bcm2835-v4l2-codec: Enable selection ioctl for ISP

The ISP cases do nothing. Remove the break that separates them from the
deinterlace case so they now do the same as deinterlace. This enables
simple width & height setting, but does not enable setting left and
top coordinates.

Signed-off-by: John Cox <jc@kynesim.co.uk>