cmn600: Stop checking type of external nodes

Merged Darryl Green requested to merge github/fork/CJKay/master into master

Created by: CJKay

Registers belonging to external nodes cannot be accessed if the power domain that the node belongs to is not on. We therefore need to avoid calling get_node_type() on external nodes, as doing so will fail.

Change-Id: Iac405c9f4c7095018cfec79185e6b84dece81e73 Signed-off-by: Chris Kay

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