clk: vc5: Configure the output buffer input mux on prepare

The output buffer input mux can be configured in either of three
states -- disabled, input from FOD, input from previous output.
Once the .prepare() callback of the output buffer is called, the
output buffer input mux must be set to either input from FOD or
input from previous output, it cannot be set to Disabled anymore
or the output won't work.

Default to the input from FOD if the output buffer input mux was
Disabled and the .prepare() was called on it.

Note that we do not set the output buffer input mux back to Disabled
in the .unprepare() callback as there is no obvious benefit of doing
so. We disable the entire output buffer in the .unprepare() callback
already.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Alexey Firago <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: [email protected]
Tested-by: Laurent Pinchart <[email protected]> # Salvator-XS with the display LVDS output.
Signed-off-by: Stephen Boyd <[email protected]>

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