firmware: arm_scmi: reset: fix reset_state assignment in scmi_domain_reset

Fix the copy paste typo that incorrectly assigns domain_id with the
passed 'state' parameter instead of reset_state.

Fixes: 95a15d80

 ("firmware: arm_scmi: Add RESET protocol in SCMI v2.0")
Reported-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>