firmware: arm_scmi: Refactor error logging from SCMI device creation to single helper

firmware: arm_scmi: Refactor error logging from SCMI device creation to single helper

Refactors the error logging related to SCMI device creation. The goal
is to remove duplicated error-handling code and centralize it into a
single helper function: _scmi_device_create().

By doing so, any code redundancy around error logging is avoided, as
error logging during device creation will now be handled by a unified
helper function.

Message-Id: <20250317-b4-scmi_minor_cleanup-v2-3-f4be99bd9864@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>