drm/vc4: hdmi: Use clk_set_min_rate instead

The HSM clock needs to be running at 101% the pixel clock of the HDMI
controller, however it's shared between the two HDMI controllers, which
means that if the resolutions are different between the two HDMI
controllers, and the lowest resolution is on the second (in enable order)
controller, the first HDMI controller will end up with a smaller than
expected clock rate.

Since we don't really need an exact frequency there, we can simply change
the minimum rate we expect instead.

Signed-off-by: Maxime Ripard <[email protected]>
Tested-by: Chanwoo Choi <[email protected]>
Tested-by: Hoegeun Kwon <[email protected]>
Tested-by: Stefan Wahren <[email protected]>
Reviewed-by: Dave Stevenson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/821992209cc0d7a83254bf26fe2bf507ef0994d2.1599120059.git-series.maxime@cerno.tech

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