[media] cx25840: fix regression in analog support hue/saturation controls
Fix regression in HVR-1800 analog support hue/saturation controls.
The changes made for the cx23888 caused regressions in the analog
support for cx23885/cx23887 based boards (partly due to changes in the
locations of the hue/saturation controls). As a result the wrong
registers were being overwritten.
Add code to use the correct registers if it's a cx23888