armv8: fsl-lsch3: Make CCN-504 related code conditional

LS2080 family has CCN-504 cache coherent interconnet. Other SoCs
in LSCH3 family may have differnt interconnect.

Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
[YS: revised commit message]
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/README b/README
index c0c8b55..ca07f7a 100644
--- a/README
+++ b/README
@@ -322,6 +322,10 @@
 		Defined For SoC that has cache coherent interconnect
 		CCN-400
 
+		CONFIG_SYS_FSL_HAS_CCN504
+
+		Defined for SoC that has cache coherent interconnect CCN-504
+
 The following options need to be configured:
 
 - CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.