MLK-17367 imx8: pm-domains: fix restore parent for clk_stat_may_lost case

MLK-17367 imx8: pm-domains: fix restore parent for clk_stat_may_lost case

imx8_rsrc_clk->parent may be cleared during last probe failure.
So we need explicitly call CLK APIs clk_get_parent to get the cached
parent for the later restore. Otherwise, it may reparent to NULL parent
which results in 0 clk rate.

Fixes: 05caa1390f88cb (" MLK-17363-1 imx8: pm-domain: fix clock parent restore issue after suspend/resume")
Reviewed-by: Anson Huang <anson.huang@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>