ARM: zynq: Define sys prompt for all Zynq boards

Define CONFIG_SYS_PROMPT for all Zynq boards

It was removed by:
"kconfig: add config option for shell prompt"
(sha1: 181bd9dc61d2da88b78f1c1138a685dae39354d6)

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/zynq_picozed_defconfig b/configs/zynq_picozed_defconfig
index 339e399..fbc603f 100644
--- a/configs/zynq_picozed_defconfig
+++ b/configs/zynq_picozed_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_ZYNQ_PICOZED=y
 CONFIG_DEFAULT_DEVICE_TREE="zynq-picozed"
 CONFIG_SPL=y
+CONFIG_SYS_PROMPT="Zynq> "
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y