Fix dtschema validator warnings like:
    l2-cache@a02000: $nodename:0:
        'l2-cache@a02000' does not match '^(cache-controller|cpu)(@[0-9a-f,]+)*$'
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>