firmware: arm_scmi: Drop redundant ->device_domain_id() from perf ops

There are no longer any users of the ->device_domain_id() ops in the
scmi_perf_proto_ops, therefore let's remove it.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20230825112633.236607-6-ulf.hansson@linaro.org


Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>