microblaze: move CONFIG_SYS_TEXT_BASE to defconfig

This is how CONFIG options are defined by Kconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
index 54aa3ef..ed336e6 100644
--- a/configs/microblaze-generic_defconfig
+++ b/configs/microblaze-generic_defconfig
@@ -1,6 +1,7 @@
 CONFIG_MICROBLAZE=y
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_TARGET_MICROBLAZE_GENERIC=y
+CONFIG_SYS_TEXT_BASE=0x29000000
 CONFIG_DEFAULT_DEVICE_TREE="microblaze-generic"
 CONFIG_SPL=y
 CONFIG_SYS_PROMPT="U-Boot-mONStR> "