gnmi container should remove privileged mode

>privileged [](http://example.com/codeflow?start=28&length=10)

Could you check [https://github.com/sonic-net/SONiC/pull/1364](https://github.com/sonic-net/SONiC/pull/1364) ? Is it possible to use fine granularity linux capacities?

_Originally posted by @qiluo-msft in https://github.com/sonic-net/sonic-buildimage/pull/24056#discussion_r2535501897_
            