drm/edid: Round to closest when computing the CEA/HDMI alternate clock

Rounding to the closest kHz seems like the better option that round
down or up when computing the alternate clock for CEA/HDMI modes.
It'll give us a slightly more accurate clock in some cases.

Not sure why I went for the down+up approach originally. Perhaps
I was thinking we can go back and forth betwen the two frequencies
without introducing errors, but round to closest still maintains
that property.

Cc: Adam Jackson <[email protected]>
Cc: Clint Taylor <[email protected]>
Cc: Libin Yang <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Adam Jackson <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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