clk: mediatek: mt8192: Correctly unregister and free clocks on failure

If anything fails during probe of the clock controller(s), unregister
(and kfree!) whatever we have previously registered to leave with a
clean state and prevent leaks.

Fixes: 710573de ("clk: mediatek: Add MT8192 basic clocks support")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Tested-by: Miles Chen <miles.chen@mediatek.com>
Link: https://lore.kernel.org/r/20230120092053.182923-2-angelogioacchino.delregno@collabora.com


Tested-by: Mingming Su <mingming.su@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>