powerpc/dts/fsl: add crypto node alias for B4

crypto node alias is needed by U-boot to identify the node and
perform fix-ups, like adding "fsl,sec-era" property.
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/boot/dts/fsl/b4qds.dtsi

@@ -40,6 +40,7 @@ / {
 	interrupt-parent = <&mpic>;
 
 	aliases {
+		crypto = &crypto;
 		phy_sgmii_10 = &phy_sgmii_10;
 		phy_sgmii_11 = &phy_sgmii_11;
 		phy_sgmii_1c = &phy_sgmii_1c;