fconf: Update dyn_config compatible string

Dynamic configuration properties are fconf properties. Modify the
compatible string from "arm,.." to "fconf,.." to reflect this.

Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
Change-Id: I85eb75cf877c5f4d3feea3936d4c348ca843bc6c
diff --git a/plat/arm/board/juno/fdts/juno_fw_config.dts b/plat/arm/board/juno/fdts/juno_fw_config.dts
index cab6f2b..4e460aa 100644
--- a/plat/arm/board/juno/fdts/juno_fw_config.dts
+++ b/plat/arm/board/juno/fdts/juno_fw_config.dts
@@ -10,7 +10,7 @@
 
 / {
 	dtb-registry {
-		compatible = "arm,dyn_cfg-dtb_registry";
+		compatible = "fconf,dyn_cfg-dtb_registry";
 
 		/* tb_fw_config is temporarily contained on this dtb */
 		tb_fw-config {