drm/vc4: hdmi: Move clock calculation into its own function

The code to compute our clock rate for a given setup will be called in
multiple places in the next patches, so let's create a separate function
for it.

Signed-off-by: Maxime Ripard <[email protected]>
Acked-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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