power: domain: scmi: Allow failure in getting power domain attribute

power: domain: scmi: Allow failure in getting power domain attribute

When one power domain fails to get attribute, continue getting attribute
for remaining power domains, not return probe failure. So other power
domains are still functional.
It is possible that one power domain is assigned to other agent or this
power domain is disabled by HW fuse, so platform returns denied or other
error.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>