clk: mediatek: mtk: Implement error handling in register APIs

The remaining clk registration functions do not stop or return errors
if any clk failed to be registered, nor do they implement error
handling paths. This may result in a partially working device if any
step fails.

Make the register functions return proper error codes, and bail out if
errors occur. Proper cleanup, i.e. unregister any clks that were
successfully registered, is done in the new error path.

This also makes the |struct clk_data *| argument mandatory, as it is
used to track the list of clks registered.

Signed-off-by: Chen-Yu Tsai <[email protected]>
Reviewed-by: Miles Chen <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Chun-Jie Chen <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

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