zynq: config: Enable CONFIG_SYS_NO_FLASH through defconfig

Enable config CONFIG_SYS_NO_FLASH through defconfig
for all zynq boards.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/zynq_zc706_defconfig b/configs/zynq_zc706_defconfig
index a03f96e..38ee30a 100644
--- a/configs/zynq_zc706_defconfig
+++ b/configs/zynq_zc706_defconfig
@@ -8,6 +8,7 @@
 CONFIG_FIT_SIGNATURE=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="Zynq> "
+CONFIG_SYS_NO_FLASH=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_MMC=y