arm64: dts: ti: k3-j721e-main: fix RNG node clock id

The RNG node for this platform claims pka_in_clk. Change it to claim the
correct clock x1_clk. [1]

[1]: https://downloads.ti.com/tisci/esd/latest/5_soc_doc/j721e/clocks.html#clocks-for-sa2-ul0-deviceSigned-off-by: Daniel Parks <danielrparks@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Jayesh Choudhary <j-choudhary@ti.com>
Link: https://lore.kernel.org/r/f29e2c65dc7310a926af8a676651592afac04b03.1659981162.git.danielrparks@ti.com

arch/arm64/boot/dts/ti/k3-j721e-main.dtsi

@@ -343,7 +343,7 @@ rng: rng@4e10000 {
 			compatible = "inside-secure,safexcel-eip76";
 			reg = <0x0 0x4e10000 0x0 0x7d>;
 			interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&k3_clks 264 1>;
+			clocks = <&k3_clks 264 2>;
 		};
 	};