arm: dts: k3-j721s2: Add r5 specific dt support

Add initial support for device tree that runs on R5.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 55a8096..5a57069 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1140,7 +1140,8 @@
 			      k3-j721e-r5-common-proc-board.dtb \
 			      k3-j7200-common-proc-board.dtb \
 			      k3-j7200-r5-common-proc-board.dtb
-dtb-$(CONFIG_SOC_K3_J721S2) += k3-j721s2-common-proc-board.dtb
+dtb-$(CONFIG_SOC_K3_J721S2) += k3-j721s2-common-proc-board.dtb\
+			       k3-j721s2-r5-common-proc-board.dtb
 dtb-$(CONFIG_SOC_K3_AM642) += k3-am642-evm.dtb \
 			      k3-am642-r5-evm.dtb \
 			      k3-am642-sk.dtb \