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Use a helper to set driver_override to reduce the amount of duplicated
code.  Make the driver_override field const char, because it is not
modified by the core and it matches other subsystems.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220419113435.246203-4-krzysztof.kozlowski@linaro.org

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>