target-arm: Add missing compatible property to A57

Signed-off-by: NRyota Ozaki <ozaki.ryota@gmail.com>
Reviewed-by: NAlistair Francis <alistair.francis@xilinx.com>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 1424097799-11002-1-git-send-email-ozaki.ryota@gmail.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target-arm/cpu64.c

@@ -96,6 +96,7 @@ static void aarch64_a57_initfn(Object *obj)
 {
     ARMCPU *cpu = ARM_CPU(obj);
 
+    cpu->dtb_compatible = "arm,cortex-a57";
     set_feature(&cpu->env, ARM_FEATURE_V8);
     set_feature(&cpu->env, ARM_FEATURE_VFP4);
     set_feature(&cpu->env, ARM_FEATURE_NEON);