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/nyan-big_defconfig b/configs/nyan-big_defconfig
index ba445a2..54cba0e 100644
--- a/configs/nyan-big_defconfig
+++ b/configs/nyan-big_defconfig
@@ -16,6 +16,7 @@
 CONFIG_BOOTSTAGE_STASH_ADDR=0x83000000
 CONFIG_SYS_STDIO_DEREGISTER=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_SPL_TEXT_BASE=0x80108000
 CONFIG_SYS_PROMPT="Tegra124 (Nyan-big) # "
 # CONFIG_CMD_IMI is not set
 CONFIG_CMD_DFU=y