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/topic_miami_defconfig b/configs/topic_miami_defconfig
index e7b6c0f..3239d99 100644
--- a/configs/topic_miami_defconfig
+++ b/configs/topic_miami_defconfig
@@ -3,6 +3,7 @@
 CONFIG_SYS_CONFIG_NAME="topic_miami"
 CONFIG_ARCH_ZYNQ=y
 CONFIG_BOOT_INIT_FILE="board/topic/zynq/zynq-topic-miami/ps7_regs.txt"
+CONFIG_SYS_TEXT_BASE=0x4000000
 CONFIG_DEFAULT_DEVICE_TREE="zynq-topic-miami"
 CONFIG_BOOTDELAY=0
 CONFIG_SYS_NO_FLASH=y