zynq: zybo: Move CONFIG_DEFAULT_DEVICE_TREE to defconfig

Move CONFIG_DEFAULT_DEVICE_TREE from board config
directly to defconfig.

This patch removes compilation warning:
include/configs/zynq_zybo.h:24:0: warning: "CONFIG_DEFAULT_DEVICE_TREE" redefined [enabled by default]
#define CONFIG_DEFAULT_DEVICE_TREE zynq-zybo

---

 configs/zynq_zybo_defconfig | 2 ++
 include/configs/zynq_zybo.h | 1 -
 2 files changed, 2 insertions(+), 1 deletion(-)

index a00f4fcea5b7..12311cd83b50 100644
@@ -2,3 +2,5 @@ CONFIG_SPL=y
 +S:CONFIG_ARM=y
 +S:CONFIG_ZYNQ=y
 +S:CONFIG_TARGET_ZYNQ_ZYBO=y
+CONFIG_OF_CONTROL=y
+CONFIG_DEFAULT_DEVICE_TREE="zynq-zybo"

index ce1527fafc51..191f2a5f301e 100644
@@ -21,7 +21,6 @@
 
 #define CONFIG_ZYNQ_SDHCI0
 #define CONFIG_ZYNQ_BOOT_FREEBSD
-#define CONFIG_DEFAULT_DEVICE_TREE	zynq-zybo
 
 /* Define ZYBO PS Clock Frequency to 50MHz */
 #define CONFIG_ZYNQ_PS_CLK_FREQ	50000000UL

--
1.8.2.3

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Applied to u-boot/master, thanks!

Tom
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