dt-bindings: PCI: qcom: Do not require resets on msm8996 platforms

On MSM8996/APQ8096 platforms the PCIe controller doesn't have any
resets. So move the requirement stanza under the corresponding if
condition.

Link: https://lore.kernel.org/r/20220506152107.1527552-3-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>