nrf54lm20a: add hfxo clock to FLPR core board dtsi

Added the hfxo clock parameter
 to nrf54lm20a board dtsi definition
 in FLPR core node.

Jira: NCSDK-34047

Signed-off-by: Jan Zyczkowski <[email protected]>

Author: zycz

dts/common/nordic/nrf54lm20a.dtsi

@@ -42,6 +42,7 @@
 			compatible = "nordic,vpr";
 			reg = <1>;
 			device_type = "cpu";
+			clocks = <&hfpll>;
 			riscv,isa = "rv32emc";
 			nordic,bus-width = <32>;
 		};