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/common/spl/Kconfig b/common/spl/Kconfig
index 206c240..dd078fe 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -56,6 +56,13 @@
 	  U-Boot stage.	 Set this to the path of the linker-script to
 	  be used for SPL.
 
+config SPL_TEXT_BASE
+	hex "SPL Text Base"
+	default ISW_ENTRY_ADDR if AM43XX || AM33XX || OMAP54XX || ARCH_KEYSTONE
+	default 0x0
+	help
+	  The address in memory that SPL will be running from.
+
 config SPL_BOARD_INIT
 	bool "Call board-specific initialization in SPL"
 	help