ARC: Add model property to boards .dts

1. This way we sync with Linux kernel where we have model
   set for all ARC boards for quite some time, see [1]

2. Once we enable DISPLAY_BOARDINFO for ARC this info will
   be printed on boot givin some extra data-point about the board

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=618a9cd06dd471ac232f5b27325b24d26eba5571

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/arch/arc/dts/abilis_tb100.dts b/arch/arc/dts/abilis_tb100.dts
index de3e57d..19e45b9 100644
--- a/arch/arc/dts/abilis_tb100.dts
+++ b/arch/arc/dts/abilis_tb100.dts
@@ -7,6 +7,8 @@
 #include "skeleton.dtsi"
 
 / {
+	model = "abilis,tb100";
+
 	aliases {
 		console = &uart0;
 	};
diff --git a/arch/arc/dts/axs101.dts b/arch/arc/dts/axs101.dts
index 13873be..fc9fa93 100644
--- a/arch/arc/dts/axs101.dts
+++ b/arch/arc/dts/axs101.dts
@@ -9,6 +9,8 @@
 
 
 / {
+	model = "snps,axs101";
+
 	chosen {
 		stdout-path = &uart0;
 	};
diff --git a/arch/arc/dts/axs103.dts b/arch/arc/dts/axs103.dts
index 81778c8..6e2dd00 100644
--- a/arch/arc/dts/axs103.dts
+++ b/arch/arc/dts/axs103.dts
@@ -9,6 +9,8 @@
 
 
 / {
+	model = "snps,axs103";
+
 	chosen {
 		stdout-path = &uart0;
 	};
diff --git a/arch/arc/dts/emdk.dts b/arch/arc/dts/emdk.dts
index 5e853e3..ebe538d 100644
--- a/arch/arc/dts/emdk.dts
+++ b/arch/arc/dts/emdk.dts
@@ -7,6 +7,8 @@
 #include "skeleton.dtsi"
 
 / {
+	model = "snps,emdk";
+
 	#address-cells = <1>;
 	#size-cells = <1>;
 
diff --git a/arch/arc/dts/hsdk.dts b/arch/arc/dts/hsdk.dts
index 673bc5b..f024b96 100644
--- a/arch/arc/dts/hsdk.dts
+++ b/arch/arc/dts/hsdk.dts
@@ -8,6 +8,8 @@
 #include "dt-bindings/clock/snps,hsdk-cgu.h"
 
 / {
+	model = "snps,hsdk";
+
 	#address-cells = <1>;
 	#size-cells = <1>;
 
diff --git a/arch/arc/dts/nsim.dts b/arch/arc/dts/nsim.dts
index 9c1c7aa..243ecb1 100644
--- a/arch/arc/dts/nsim.dts
+++ b/arch/arc/dts/nsim.dts
@@ -7,6 +7,8 @@
 #include "skeleton.dtsi"
 
 / {
+	model = "snps,nsim";
+
 	aliases {
 		console = &arcuart0;
 	};