Added dcp_rng driver initialization code

This commit initializes dcp_rng device driver inside
arch_misc_init() function.

Signed-off-by: Kshitiz Varshney <kshitiz.varshney@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
diff --git a/arch/arm/mach-imx/mx6/soc.c b/arch/arm/mach-imx/mx6/soc.c
index 08f47cf..c2875e7 100644
--- a/arch/arm/mach-imx/mx6/soc.c
+++ b/arch/arm/mach-imx/mx6/soc.c
@@ -746,6 +746,16 @@
 		if (ret)
 			printf("Failed to initialize caam_jr: %d\n", ret);
 	}
+
+	if (IS_ENABLED(CONFIG_FSL_DCP_RNG)) {
+		struct udevice *dev;
+		int ret;
+
+		ret = uclass_get_device_by_driver(UCLASS_RNG, DM_DRIVER_GET(dcp_rng), &dev);
+		if (ret)
+			printf("Failed to initialize dcp rng: %d\n", ret);
+	}
+
 	setup_serial_number();
 	return 0;
 }