dt-bindings: phy: samsung,ufs-phy: make pmu-syscon as phandle-array

To support secondary ufs phy devices, we need to get an offset value
from pmu-syscon.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20220607072907.127000-2-chanho61.park@samsung.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>