clk: sunxi-ng: a64: force select PLL_MIPI in TCON0 mux

TCON0's source clock can be fed from either PLL_MIPI, or PLL_VIDEO0(2X),
however MIPI DSI output only seems to work when PLL_MIPI is selected and
thus the choice must be hardcoded in.

Currently, this driver can't propagate rate change from N-K-M clocks
(such as PLL_MIPI) upwards. This prevents PLL_VIDEO0 from participating
in setting of the TCON0 data clock rate, limiting the precision with
which a target pixel clock can be matched.

For outputs with fixed TCON0 divider, that is DSI and LVDS, the dotclock
can deviate up to 8% off target.

Signed-off-by: Roman Beranek <[email protected]>
Reviewed-by: Jernej Skrabec <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jernej Skrabec <[email protected]>

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