ARM: dts: STi: STih407: Switch LPC mode from RTC to Clocksource

This aligns with the internal configuration.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih407-family.dtsi

@@ -584,7 +584,7 @@ lpc@8788000 {
 			reg = <0x8788000 0x1000>;
 			interrupts = <GIC_SPI 130 IRQ_TYPE_EDGE_RISING>;
 			clocks = <&clk_s_d3_flexgen CLK_LPC_1>;
-			st,lpc-mode = <ST_LPC_MODE_RTC>;
+			st,lpc-mode = <ST_LPC_MODE_CLKSRC>;
 		};
 
 		sata0: sata@9b20000 {