[RESEND PATCH v6 7/8] clk: mediatek: clk-apmixed: Add helper function to unregister ref2usb_tx

[Chen-Yu Tsai]

On Wed, Sep 21, 2022 at 5:15 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno at collabora.com> wrote:
>
> The ref2usb_tx clock was introduced a long time ago and, at that time,
> the MediaTek clock drivers were using CLK_OF_DECLARE, so they would
> never unregister.
>
> Nowadays, unregistering clock drivers is a thing, as we're registering
> them as platform_driver and allowing them to be kernel modules: add a
> helper function to cleanup the ref2usb_tx clock during error handling
> and upon module removal.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>

Reviewed-by: Chen-Yu Tsai <wenst at chromium.org>