Provide the maxItem property for the reset controllers and drop their
superfluous descriptions.

Link: https://lore.kernel.org/linux-pci/20240815225731.40276-3-james.quinlan@broadcom.comSigned-off-by: Jim Quinlan <james.quinlan@broadcom.com>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>