arm64: dts: qcom: Drop undocumented domain "idle-state-name"

"idle-state-name" is not a valid property for "domain-idle-state"
binding, so drop it.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241014161631.1527918-2-robh@kernel.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>