arm: dts: ast2600-x4tf: Add new dts for ASUS X4TF

This is the new bmc dts for ASUS X4TF server.

Signed-off-by: Kelly Hung <Kelly_Hung@asus.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index e2c1db2..d445166 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1348,7 +1348,9 @@
 	bcm96878.dtb
 
 dtb-$(CONFIG_ASPEED_AST2500) += ast2500-evb.dtb
-dtb-$(CONFIG_ASPEED_AST2600) += ast2600-evb.dtb
+dtb-$(CONFIG_ASPEED_AST2600) += \
+	ast2600-evb.dtb \
+	ast2600-x4tf.dtb
 
 dtb-$(CONFIG_ARCH_STI) += stih410-b2260.dtb