arm: dts: k3-am68-sk: Add r5 specific dt support

Add initial support for AM68 SK device tree that runs on R5.

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index d397076..3ecd6a8 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1255,6 +1255,7 @@
 			      k3-j721e-sk.dtb \
 			      k3-j721e-r5-sk.dtb
 dtb-$(CONFIG_SOC_K3_J721S2) += k3-am68-sk-base-board.dtb\
+			       k3-am68-sk-r5-base-board.dtb\
 			       k3-j721s2-common-proc-board.dtb\
 			       k3-j721s2-r5-common-proc-board.dtb
 dtb-$(CONFIG_SOC_K3_AM642) += k3-am642-evm.dtb \