opp: fix use after free in _update_opp_table_clk()

dev_pm_opp_put_opp_table() frees the opp_table which is subsquently used
by dev_err_probe(). This causes an Oops during boot on gs101-oriole.

cpu cpu0: error 000000006b6b6b6b: Couldn't find clock
Unable to handle kernel paging request at virtual address 006b6b6b6b6b6cd3
...
Hardware name: Oriole (DT)
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : _of_add_table_indexed+0x80/0xbb0
lr : _of_add_table_indexed+0x6c/0xbb0
...
Call trace:
 _of_add_table_indexed+0x80/0xbb0 (P)
 dev_pm_opp_of_cpumask_add_table+0x70/0x120
 dt_cpufreq_probe+0x23c/0x480
 platform_probe+0x64/0xb8

Fixes: 84f05af0975c9 ("opp: Use clk_get_optional() to avoid leaving opp_table->clk as an error pointer")
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
[ Viresh: use return value of dev_err_probe() ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>