phy: samsung-ufs: use exynos_get_pmu_regmap_by_phandle() to obtain PMU regmap

phy: samsung-ufs: use exynos_get_pmu_regmap_by_phandle() to obtain PMU regmap

This allows us to obtain a PMU regmap that is created by the exynos-pmu
driver. Platforms such as gs101 require exynos-pmu created regmap to
issue SMC calls for PMU register accesses. Existing platforms still get
a MMIO regmap as before.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: André Draszik <andre.draszik@linaro.org>
Link: https://lore.kernel.org/r/20240404122559.898930-10-peter.griffin@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>