zynq: make title consistent for all devices

Modify the title to match the following format, as it's enough
to uniquely identify a device:
<manufacturer> <model>

This matches what's done for other targets and has the
added benefit of creating a sorted-by-manufacturer list
of devices on menuconfig

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

target/linux/zynq/image/Makefile

@@ -51,28 +51,28 @@ endef
 
 define Device/avnet_zynq-zed
 	$(call Device/FitImageGzip)
-	DEVICE_TITLE := Avnet ZedBoard board
+	DEVICE_TITLE := Avnet ZedBoard
 	DEVICE_DTS := zynq-zed
 endef
 TARGET_DEVICES += avnet_zynq-zed
 
 define Device/digilent_zynq-zybo
 	$(call Device/FitImageGzip)
-	DEVICE_TITLE := ZYBO Development Board
+	DEVICE_TITLE := Digilent Zybo
 	DEVICE_DTS := zynq-zybo
 endef
 TARGET_DEVICES += digilent_zynq-zybo
 
 define Device/digilent_zynq-zybo-z7
 	$(call Device/FitImageGzip)
-	DEVICE_TITLE := Digilent Zybo Z7 board
+	DEVICE_TITLE := Digilent Zybo Z7
 	DEVICE_DTS := zynq-zybo-z7
 endef
 TARGET_DEVICES += digilent_zynq-zybo-z7
 
 define Device/xlnx_zynq-zc702
 	$(call Device/FitImageGzip)
-	DEVICE_TITLE := ZC702 Development Board
+	DEVICE_TITLE := Xilinx ZC702
 	DEVICE_DTS := zynq-zc702
 	DEVICE_PACKAGES:=kmod-can kmod-can-xilinx-can
 endef