clk: imx: imx8: Fix an error handling path in clk_imx_acm_attach_pm_domains()

If a dev_pm_domain_attach_by_id() call fails, previously allocated
resources need to be released.

Fixes: d3a0946d ("clk: imx: imx8: add audio clock mux driver")
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>