configs: move CONFIG_SPL_TEXT_BASE to Kconfig

Moved CONFIG_SPL_TEXT_BASE to common/spl/Kconfig and migrate existing
values.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
[trini: Re-run migration]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/udoo_neo_defconfig b/configs/udoo_neo_defconfig
index c9210bf..603d367 100644
--- a/configs/udoo_neo_defconfig
+++ b/configs/udoo_neo_defconfig
@@ -16,6 +16,7 @@
 CONFIG_BOOTCOMMAND="run findfdt; run distro_bootcmd"
 CONFIG_BOUNCE_BUFFER=y
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_SPL_TEXT_BASE=0x00908000
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_FS_EXT4=y
 CONFIG_SPL_WATCHDOG_SUPPORT=y