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/cm_t35_defconfig b/configs/cm_t35_defconfig
index d4a363f..f363914 100644
--- a/configs/cm_t35_defconfig
+++ b/configs/cm_t35_defconfig
@@ -8,6 +8,7 @@
 CONFIG_BOOTDELAY=3
 # CONFIG_CONSOLE_MUX is not set
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_SPL_TEXT_BASE=0x40200800
 # CONFIG_SPL_FS_EXT4 is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="CM-T3x # "