phy: rockchip-inno-usb2: Fix missing clk_disable_unprepare() in rockchip_usb2phy_power_on()

The clk_disable_unprepare() should be called in the error handling of
rockchip_usb2phy_power_on().

Fixes: 0e08d2a7

 ("phy: rockchip-inno-usb2: add a new driver for Rockchip usb2phy")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Link: https://lore.kernel.org/r/20221205115823.16957-1-shangxiaojing@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>