Fix dtschema validator warnings like:
l2-cache-controller@c00000: $nodename:0:
'l2-cache-controller@c00000' does not match '^(cache-controller|cpu)(@[0-9a-f,]+)*$'
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Reviewed-by: Jun Nie <jun.nie@linaro.org>