Add clk_disable_unprepare(core_clk) when enable iface_clk failed.

Fixes: a7e12e7b ("soc: qcom: ocmem: make iface clock optional")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20230802024855.2521895-1-yangyingliang@huawei.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>