Look at the clock-names schema defined in arm,mali-utgard.yaml:
clock-names:
  items:
    - const: bus
    - const: core

The "bus" needs to be placed before the "core".
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>