arm64: dts: exynos: drop unneeded syscon phandle in Exynos5433 LPASS

Exynos5433 LPASS audio node does not use syscon phandle since commit
addebf15 ("mfd: exynos-lpass: Remove pad retention control").  It
was also dropped from bindings.
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: NAlim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20220129175332.298666-2-krzysztof.kozlowski@canonical.com

arch/arm64/boot/dts/exynos/exynos5433.dtsi

@@ -1885,7 +1885,6 @@
 			reg = <0x11400000 0x100>, <0x11500000 0x08>;
 			clocks = <&cmu_aud CLK_PCLK_SFR0_CTRL>;
 			clock-names = "sfr0_ctrl";
-			samsung,pmu-syscon = <&pmu_system_controller>;
 			power-domains = <&pd_aud>;
 			#address-cells = <1>;
 			#size-cells = <1>;