MLK-20931: drm/imx/dcss: Add scaler 5 tap filter back for YUV

The following commit:

459a5fac - MLK-20263: drm/imx/dcss: fix channel-0 line shift

removed the 5 tap filter for vertical luma/chroma when YUV formats were
used.

Problem is that when the 7 tap filter is used for vertical luma/chroma,
artifacts can be seen on screen when scaling.

RGB can, however, function correctly with only 7 tap filter.

This patch partially reverts the above patch and also does some cosmetic
changes when calling the dcss_scaler_filter_design() using false/true
instead of 0/1 for use_5_taps argument.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>