dt-bindings: phy: qcom,ipq8074-qmp-pcie: fix warning regarding reg size

Fix the 'reg is too long' warning caused by me adding 64-bit address and
size to the example, while default being 32-bit (cell size equal to 1).

Reported-by: Rob Herring <robh+dt@kernel.org>
Fixes: 505fb254

 ("dt-bindings: phy: migrate QMP PCIe PHY bindings to qcom,sc8280xp-qmp-pcie-phy.yaml")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230823181728.3082946-1-dmitry.baryshkov@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>