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/mt7629_rfb_defconfig b/configs/mt7629_rfb_defconfig
index 459c678..01b952f 100644
--- a/configs/mt7629_rfb_defconfig
+++ b/configs/mt7629_rfb_defconfig
@@ -13,6 +13,7 @@
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_DEFAULT_FDT_FILE="mt7629-rfb"
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_SPL_TEXT_BASE=0x201000
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_SPL_WATCHDOG_SUPPORT=y