ARM: zynq: Move CONFIG_SYS_TEXT_BASE to Kconfig

Enable CONFIG_SYS_TEXT_BASE via Kconfig.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/zynq_zc770_xm011_defconfig b/configs/zynq_zc770_xm011_defconfig
index 247fb6d..ae7a631 100644
--- a/configs/zynq_zc770_xm011_defconfig
+++ b/configs/zynq_zc770_xm011_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_ARCH_ZYNQ=y
 # CONFIG_MMC is not set
+CONFIG_SYS_TEXT_BASE=0x4000000
 CONFIG_DEFAULT_DEVICE_TREE="zynq-zc770-xm011"
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y