dts: arm: st: l0: update hsi clock node to use hsi divider

Updated the clk_hsi node to use the "st,stm32l0-hsi-clock"
compatible to use hsi divider.

Signed-off-by: Khaoula Bidani <khaoula.bidani-ext@st.com>

Author: kbidani

dts/arm/st/l0/stm32l0.dtsi

@@ -56,8 +56,9 @@
 
 		clk_hsi: clk-hsi {
 			#clock-cells = <0>;
-			compatible = "fixed-clock";
 			clock-frequency = <DT_FREQ_M(16)>;
+			compatible = "st,stm32l0-hsi-clock";
+			hsi-div = <1>;
 			status = "disabled";
 		};