firmware: arm_scmi: Harden accesses to the reset domains

[ Upstream commit e9076ffb

 ]

Accessing reset domains descriptors by the index upon the SCMI drivers
requests through the SCMI reset operations interface can potentially
lead to out-of-bound violations if the SCMI driver misbehave.

Add an internal consistency check before any such domains descriptors
accesses.

Link: https://lore.kernel.org/r/20220817172731.1185305-5-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Stable-dep-of: b75c83d9

 ("firmware: arm_scmi: Fix the asynchronous reset requests")
Signed-off-by: Sasha Levin <sashal@kernel.org>