ipq806x: add missing dt compatible string to ap-dk04 board

Compatible string is mandatory to dts files

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

target/linux/ipq806x/patches-4.9/0026-dts-ipq4019-Add-support-for-IPQ4019-DK04-board.patch

@@ -34,7 +34,7 @@ Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
  	qcom-msm8960-cdp.dtb \
 --- /dev/null
 +++ b/arch/arm/boot/dts/qcom-ipq4019-ap.dk04.1-c1.dts
-@@ -0,0 +1,21 @@
+@@ -0,0 +1,22 @@
 +/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
 + *
 + * Permission to use, copy, modify, and/or distribute this software for any
@@ -55,6 +55,7 @@ Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
 +
 +/ {
 +	model = "Qualcomm Technologies, Inc. IPQ40xx/AP-DK04.1-C1";
++	compatible = "qcom,ap-dk04.1-c1", "qcom,ipq4019";
 +};
 --- /dev/null
 +++ b/arch/arm/boot/dts/qcom-ipq4019-ap.dk04.1.dtsi